While the couple and their relatives expressed their excitement over the news, there is a fascinating law in place that means that Prince Harry and Meghan may not always have full legal custody of their child.
More than three centuries ago, a law was enacted that means the sovereign has full legal custody of their minor grandchildren, royal expert Marlene Koenig explains.
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The law, called “The Grand Opinion for the Prerogative Concerning the Royal Family,” was introduced by King George I in 1717.
“George I did not get along with his son, the future George II,” Koenig tells The Independent.
Royal Wedding - Prince Harry marries Meghan Markle in pictures
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The Duke and Duchess of Sussex kiss on the steps of St George’s Chapel after their wedding
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Top gear: William and Kate had an Aston Martin with balloons and a JUST WED number plate. Harry and Meghan score extra points: this 1968 E-type Jag, which took them to the evening party at Frogmore House, has been converted to electric power. And the number plate, E190518? It’s their anniversary
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Meghan Markle and Prince Harry leave St George’s Chapel at Windsor Castle after their wedding
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Prince Harry and Meghan Markle leave St George’s Chapel in Windsor Castle after their wedding in Windsor
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Prince Harry and Meghan Markle stand at the altar
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Kingdom Choir outside St George’s Chapel in Windsor, Berkshire, after performing at the wedding
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Guests toast as they attend a viewing party for the royal wedding at the Plaza Hotel in New York
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Meghan Markle reaches the altar in St George’s Chapel
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John Major and his wife Norma Major attend the royal wedding ceremony
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Meghan Markle arrives for the wedding ceremony to marry Prince Harry
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Fans attend a Royal Wedding watching party at Lillie’s Victorian Establishment in New York
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Prince Harry, Duke of Sussex and his wife Meghan, Duchess of Sussex emerge from the West Door of St George’s Chapel
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Well-wishers lining the streets wave and cheer as Britain's Prince Harry, Duke of Sussex and his wife Meghan, Duchess of Sussex pass riding in the Ascot Landau Carriage during their carriage procession
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James Blunt and Sofia Wellesley attend the royal wedding ceremony of Prince Harry and Meghan Markle
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Prince Harry and Meghan Markle kiss on the steps of St George’s Chapel in Windsor Castle after their wedding
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Charlotte Riley and Tom Hardy arrive for the wedding of Prince Harry and Meghan Markle
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Prince Harry, Duke of Sussex and his wife Meghan, Duchess of Sussex begin their carriage procession in the Ascot Landau Carriage after their wedding ceremony
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James Corden and Julia Carey attend the royal wedding ceremony
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Harry and Meghan emerge from the West Door of St George’s Chapel
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Left to right, Lady Louise Windsor, Sophie, Countess of Wessex and Princess Anne, Princess Royal arrive for the wedding of Prince Harry to Meghan Markle
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Prince Harry looks at his bride, Meghan Markle, as she arrives accompanied by the Prince of Wales in St George's Chapel at Windsor Castle for their wedding in Windsor, Britain
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Serena Williams and Alexis Ohanian arrive at St George’s Chapel
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Prince Harry places the wedding ring on the finger of Meghan Markle during their wedding service, conducted by the Archbishop of Canterbury Justin Welby
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The royal wedding cake has been revealed
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Members of the public view a live screening of the marriage ceremony of Prince Harry and Meghan Markle at Winchester Cathedral
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The Duke of Cambridge (left), the Duchess of Cambridge and the Duke of York during the wedding service for Prince Harry and Meghan Markle at St George's Chapel, Windsor Castle
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Prince Harry and Meghan Markle in St George's Chapel at Windsor Castle during their wedding service
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US actor Abigail Spencer (left) and Indian actor Priyanka Chopra (second from left) arrive with other guests for the royal wedding
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Meghan Markle and her mother Doria Ragland drive along the Long Walk for her wedding to Prince Harry in Windsor
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Sir Elton John leaves St George’s Chapel
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Meghan Markle and her mother Doria Ragland drive along the Long Walk for her wedding to Prince Harry in Windsor
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Oprah Winfrey arrives at St George’s Chapel
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Prince Harry's niece and bridesmaid Princess Charlotte arrives for the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle at St George's Chapel, Windsor Castle, in Windsor
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Prince Harry and Meghan Markle in St George's Chapel at Windsor Castle for their wedding
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Bishop Michael Curry delivered a passionate sermon during the royal wedding ceremony
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In this frame from video, Meghan Markle walks down the aisle with Prince Charles for her wedding ceremony at St. George's Chapel in Windsor Castle in Windsor, near London, England
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Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall attend the wedding of Prince Harry and Meghan Markle in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England
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Meghan Markle is driven by the Long Walk to St George's Chapel in Windsor Castle for her royal wedding ceremony to Britain's Prince Harry, in Windsor, Britain
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Meghan Markle is driven down the Long Walk to St George's Chapel in Windsor Castle for her royal wedding ceremony to Britain's Prince Harry, in Windsor, Britain
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Meghan Markle arrives for the wedding ceremony to marry Britain's Prince Harry, Duke of Sussex, at St George's Chapel, Windsor
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Catherine, Duchess of Cambridge arrives at St George's Chapel at Windsor Castle before the wedding of Prince Harry to Meghan Markle
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Meghan Markle arrives at St George's Chapel at Windsor Castle for her wedding to Prince Harry
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Bridesmaids and pageboys arrive for the royal wedding ceremony of Britain's Prince Harry and Meghan Markle at St George's Chapel in Windsor Castle, in Windsor, Britain
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Meghan Markle (R) with her mother Doria Ragland arrive at Windsor Castle ahead of her wedding to Prince Harry on May 19, 2018 in Windsor, England. Prince Henry Charles Albert David of Wales marries Ms. Meghan Markle in a service at St George's Chapel inside the grounds of Windsor Castle. Among the guests were 2200 members of the public, the royal family and Ms. Markle's Mother Doria Ragland
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Princess Charlotte (right) arrives for the wedding of Prince Harry and Meghan Markle at Windsor Castle
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The Prince of Wales and Duchess of Cornwall arrive at St George's Chapel at Windsor Castle for the wedding of Meghan Markle and Prince Harry
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Meghan Markle, right, and her mother Doria Ragland leave Cliveden House Hotel in Taplow, near London, England
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Meghan Markle arrives at St George's Chapel at Windsor Castle for her wedding
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Doria Ragland arrives at St George's Chapel at Windsor Castle for the wedding of Meghan Markle and Prince Harry
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Prince Harry (right) sits with his best man the Duke of Cambridge in St George's Chapel at Windsor Castle ahead of his wedding to Meghan markle wedding
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Guests are pictured as they take their seats inside the Chapel ahead of the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle in St George's Chapel, Windsor Castle, in Windsor
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Britain's Prince Harry (R) and his brother and best man, Prince William (C), Duke of Cambridge arrive at St George's Chapel in Windsor Castle for his royal wedding ceremony to Meghan Markle, in Windsor, Britain
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Prince Harry (left) and the Duke of Cambridge arrive at St George's Chapel at Windsor Castle for the wedding of Meghan Markle and Prince Harry
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Meghan Markle leaves Cliveden House Hotel in Taplow, near London, England, Saturday, May 19, 2018 before her wedding ceremony with Prince Harry at St. George's Chapel in Windsor Castl
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Britain's Prince Harry (L), Duke of Sussex, arrives with his best man Prince William, Duke of Cambridge (R), at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018 for his wedding ceremony to marry US actress Meghan Markle
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British Ministry of Defence shows around members of the Band of the Irish Guards entertaining the public ahead of the royal wedding ceremony of Britain's Prince Harry and Meghan Markle in Windsor, Britain,
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Princess Eugenie, The Duke of York and Princess Beatrice, from left, arrive for the wedding ceremony of Prince Harry and Meghan Markle
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Key News’s Kay Burley enjoys the moment
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Sarah Ferguson leaves after the wedding ceremony of Prince Harry and Meghan Markle
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A general view of guests arriving in St George's Chapel at Windsor Castle for the wedding of Prince Harry and Meghan Markle in Windsor, Britain
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Amal and George Clooney arrive for the wedding ceremony
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Guests arrive at St George's Chapel in Windsor Castle for the wedding of Prince Harry and Meghan Markle
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US tennis player Serena Williams (L) and her husband American Internet entrepreneur and investor Alexis Ohanian (R) arrive for the royal wedding ceremony of Britain's Prince Harry and Meghan Markle at St George's Chapel in Windsor Castle, in Windsor, Britain
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Irish Guards marching band parades through Windsor for the wedding of Prince Harry and Meghan Markle at Windsor Castle
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Members of the public gather ahead at Windsor Castle for the wedding of Meghan Markle and Prince Harry on May 19, 2018 in Windsor, England
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Alison Tinsley on the Long Walk ahead of the wedding of Prince Harry and Meghan Markle.
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Police patrol the streets ahead of the royal wedding ceremony of Britain's Prince Harry and Meghan Markle at St George's Chapel in Windsor Castle, in Windsor, Britain
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Royal fans wearing wedding dresses hold a sign reading ‘When Harry met Meghan he hadn’t met us first’ ahead of the royal wedding ceremony
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Well-wishers gather to watch the Royal Wedding of Britain’s Prince Harry, Duke of Sussex, and US actress Meghan Markle at the Pear Tree in Edinburgh
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Members of the public gather near Windsor Castle prior to the wedding of HRH Prince Harry Harry to Ms. Meghan Markle on May 19, 2018 in Windsor, England
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Guardsman play for the crowd ahead of the royal wedding ceremony of Britain's Prince Harry and Meghan Markle at St George's Chapel in Windsor Castle, in Windsor
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Royal fans wear wedding dresses near the castle before the wedding of Prince Harry Harry to Ms. Meghan Markle at St George's Chapel, Windsor Castle. Prince Henry Charles Albert David of Wales marries Ms. Meghan Markle in a service at St George's Chapel inside the grounds of Windsor Castle. Among the guests were 2200 members of the public, the royal family and Ms. Markle's Mother Doria Ragland
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War Veteran Phyllis Walker smiles during the wedding of Prince Harry Harry to Ms. Meghan Markle at Cambridge Gate
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David and Victoria Beckham arrive at St George's Chapel at Windsor Castle
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Royal fans within the grounds of Windsor Castle ahead of the wedding of Meghan Markle and Prince Harry.
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Royal fans gather behind the barriers on the Long Walk, in Windsor, ahead of the wedding and carriage procession of Prince Harry and Meghan Markle in St George's Chapel at Windsor Castle.
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Royal fans soak up the atmopshere during the wedding of Prince Harry Harry to Ms. Meghan Markle on The Long Walk
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A man sweeps the path outside St George's Chapel in Windsor Castle ahead of the wedding and carriage procession of Britain's Prince Harry and Meghan Markle in Windsor
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Two men wearing wedding dresses buy train tickets to Windsor to watch the Royal Wedding of Prince Harry and Meghan Markle at Waterloo train station
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Crowds gather during the wedding of Prince Harry Harry to Ms. Meghan Markle on The Long Walk
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Well-wishers draped in a Union flag with an image of Britain's Prince Harry and his fiancee Meghan Markle walk along the Long Walk leading to Windsor Castle ahead of the wedding and carriage procession of Britain's Prince Harry and Meghan Markle in Windsor
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Royal fans line the Long Walk in Windsor ahead of the wedding of Prince Harry and Meghan Markle
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The Duke and Duchess of Sussex kiss on the steps of St George’s Chapel after their wedding
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Top gear: William and Kate had an Aston Martin with balloons and a JUST WED number plate. Harry and Meghan score extra points: this 1968 E-type Jag, which took them to the evening party at Frogmore House, has been converted to electric power. And the number plate, E190518? It’s their anniversary
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Meghan Markle and Prince Harry leave St George’s Chapel at Windsor Castle after their wedding
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Prince Harry and Meghan Markle leave St George’s Chapel in Windsor Castle after their wedding in Windsor
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Prince Harry and Meghan Markle stand at the altar
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Kingdom Choir outside St George’s Chapel in Windsor, Berkshire, after performing at the wedding
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The pageboy whose smile went viral
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Guests toast as they attend a viewing party for the royal wedding at the Plaza Hotel in New York
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Meghan Markle reaches the altar in St George’s Chapel
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John Major and his wife Norma Major attend the royal wedding ceremony
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Meghan Markle arrives for the wedding ceremony to marry Prince Harry
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Fans attend a Royal Wedding watching party at Lillie’s Victorian Establishment in New York
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Prince Harry, Duke of Sussex and his wife Meghan, Duchess of Sussex emerge from the West Door of St George’s Chapel
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Well-wishers lining the streets wave and cheer as Britain's Prince Harry, Duke of Sussex and his wife Meghan, Duchess of Sussex pass riding in the Ascot Landau Carriage during their carriage procession
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James Blunt and Sofia Wellesley attend the royal wedding ceremony of Prince Harry and Meghan Markle
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Prince Harry and Meghan Markle kiss on the steps of St George’s Chapel in Windsor Castle after their wedding
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Charlotte Riley and Tom Hardy arrive for the wedding of Prince Harry and Meghan Markle
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Prince Harry, Duke of Sussex and his wife Meghan, Duchess of Sussex begin their carriage procession in the Ascot Landau Carriage after their wedding ceremony
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James Corden and Julia Carey attend the royal wedding ceremony
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Harry and Meghan emerge from the West Door of St George’s Chapel
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Left to right, Lady Louise Windsor, Sophie, Countess of Wessex and Princess Anne, Princess Royal arrive for the wedding of Prince Harry to Meghan Markle
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Prince Harry looks at his bride, Meghan Markle, as she arrives accompanied by the Prince of Wales in St George's Chapel at Windsor Castle for their wedding in Windsor, Britain
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Serena Williams and Alexis Ohanian arrive at St George’s Chapel
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Prince Harry places the wedding ring on the finger of Meghan Markle during their wedding service, conducted by the Archbishop of Canterbury Justin Welby
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The royal wedding cake has been revealed
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Members of the public view a live screening of the marriage ceremony of Prince Harry and Meghan Markle at Winchester Cathedral
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The Duke of Cambridge (left), the Duchess of Cambridge and the Duke of York during the wedding service for Prince Harry and Meghan Markle at St George's Chapel, Windsor Castle
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Prince Harry and Meghan Markle in St George's Chapel at Windsor Castle during their wedding service
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US actor Abigail Spencer (left) and Indian actor Priyanka Chopra (second from left) arrive with other guests for the royal wedding
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Meghan Markle and her mother Doria Ragland drive along the Long Walk for her wedding to Prince Harry in Windsor
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Sir Elton John leaves St George’s Chapel
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Meghan Markle and her mother Doria Ragland drive along the Long Walk for her wedding to Prince Harry in Windsor
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Oprah Winfrey arrives at St George’s Chapel
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Prince Harry's niece and bridesmaid Princess Charlotte arrives for the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle at St George's Chapel, Windsor Castle, in Windsor
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Prince Harry and Meghan Markle in St George's Chapel at Windsor Castle for their wedding
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Bishop Michael Curry delivered a passionate sermon during the royal wedding ceremony
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In this frame from video, Meghan Markle walks down the aisle with Prince Charles for her wedding ceremony at St. George's Chapel in Windsor Castle in Windsor, near London, England
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Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall attend the wedding of Prince Harry and Meghan Markle in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England
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Meghan Markle is driven by the Long Walk to St George's Chapel in Windsor Castle for her royal wedding ceremony to Britain's Prince Harry, in Windsor, Britain
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Meghan Markle is driven down the Long Walk to St George's Chapel in Windsor Castle for her royal wedding ceremony to Britain's Prince Harry, in Windsor, Britain
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Meghan Markle arrives for the wedding ceremony to marry Britain's Prince Harry, Duke of Sussex, at St George's Chapel, Windsor
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Catherine, Duchess of Cambridge arrives at St George's Chapel at Windsor Castle before the wedding of Prince Harry to Meghan Markle
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Meghan Markle arrives at St George's Chapel at Windsor Castle for her wedding to Prince Harry
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Bridesmaids and pageboys arrive for the royal wedding ceremony of Britain's Prince Harry and Meghan Markle at St George's Chapel in Windsor Castle, in Windsor, Britain
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Meghan Markle (R) with her mother Doria Ragland arrive at Windsor Castle ahead of her wedding to Prince Harry on May 19, 2018 in Windsor, England. Prince Henry Charles Albert David of Wales marries Ms. Meghan Markle in a service at St George's Chapel inside the grounds of Windsor Castle. Among the guests were 2200 members of the public, the royal family and Ms. Markle's Mother Doria Ragland
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Princess Charlotte (right) arrives for the wedding of Prince Harry and Meghan Markle at Windsor Castle
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The Prince of Wales and Duchess of Cornwall arrive at St George's Chapel at Windsor Castle for the wedding of Meghan Markle and Prince Harry
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Meghan Markle, right, and her mother Doria Ragland leave Cliveden House Hotel in Taplow, near London, England
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Meghan Markle arrives at St George's Chapel at Windsor Castle for her wedding
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Doria Ragland arrives at St George's Chapel at Windsor Castle for the wedding of Meghan Markle and Prince Harry
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Prince Harry (right) sits with his best man the Duke of Cambridge in St George's Chapel at Windsor Castle ahead of his wedding to Meghan markle wedding
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Guests are pictured as they take their seats inside the Chapel ahead of the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle in St George's Chapel, Windsor Castle, in Windsor
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Britain's Prince Harry (R) and his brother and best man, Prince William (C), Duke of Cambridge arrive at St George's Chapel in Windsor Castle for his royal wedding ceremony to Meghan Markle, in Windsor, Britain
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Prince Harry (left) and the Duke of Cambridge arrive at St George's Chapel at Windsor Castle for the wedding of Meghan Markle and Prince Harry
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Meghan Markle leaves Cliveden House Hotel in Taplow, near London, England, Saturday, May 19, 2018 before her wedding ceremony with Prince Harry at St. George's Chapel in Windsor Castl
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Britain's Prince Harry (L), Duke of Sussex, arrives with his best man Prince William, Duke of Cambridge (R), at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018 for his wedding ceremony to marry US actress Meghan Markle
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British Ministry of Defence shows around members of the Band of the Irish Guards entertaining the public ahead of the royal wedding ceremony of Britain's Prince Harry and Meghan Markle in Windsor, Britain,
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Princess Eugenie, The Duke of York and Princess Beatrice, from left, arrive for the wedding ceremony of Prince Harry and Meghan Markle
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Key News’s Kay Burley enjoys the moment
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Sarah Ferguson leaves after the wedding ceremony of Prince Harry and Meghan Markle
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A general view of guests arriving in St George's Chapel at Windsor Castle for the wedding of Prince Harry and Meghan Markle in Windsor, Britain
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Amal and George Clooney arrive for the wedding ceremony
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Guests arrive at St George's Chapel in Windsor Castle for the wedding of Prince Harry and Meghan Markle
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US tennis player Serena Williams (L) and her husband American Internet entrepreneur and investor Alexis Ohanian (R) arrive for the royal wedding ceremony of Britain's Prince Harry and Meghan Markle at St George's Chapel in Windsor Castle, in Windsor, Britain
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Irish Guards marching band parades through Windsor for the wedding of Prince Harry and Meghan Markle at Windsor Castle
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Members of the public gather ahead at Windsor Castle for the wedding of Meghan Markle and Prince Harry on May 19, 2018 in Windsor, England
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Alison Tinsley on the Long Walk ahead of the wedding of Prince Harry and Meghan Markle.
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Police patrol the streets ahead of the royal wedding ceremony of Britain's Prince Harry and Meghan Markle at St George's Chapel in Windsor Castle, in Windsor, Britain
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Royal fans wearing wedding dresses hold a sign reading ‘When Harry met Meghan he hadn’t met us first’ ahead of the royal wedding ceremony
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Well-wishers gather to watch the Royal Wedding of Britain’s Prince Harry, Duke of Sussex, and US actress Meghan Markle at the Pear Tree in Edinburgh
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Members of the public gather near Windsor Castle prior to the wedding of HRH Prince Harry Harry to Ms. Meghan Markle on May 19, 2018 in Windsor, England
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Guardsman play for the crowd ahead of the royal wedding ceremony of Britain's Prince Harry and Meghan Markle at St George's Chapel in Windsor Castle, in Windsor
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Royal fans wear wedding dresses near the castle before the wedding of Prince Harry Harry to Ms. Meghan Markle at St George's Chapel, Windsor Castle. Prince Henry Charles Albert David of Wales marries Ms. Meghan Markle in a service at St George's Chapel inside the grounds of Windsor Castle. Among the guests were 2200 members of the public, the royal family and Ms. Markle's Mother Doria Ragland
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War Veteran Phyllis Walker smiles during the wedding of Prince Harry Harry to Ms. Meghan Markle at Cambridge Gate
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David and Victoria Beckham arrive at St George's Chapel at Windsor Castle
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Band of the Irish Guards perform outside the castle prior to the wedding of Prince Harry Harry to Ms. Meghan Markle St George's Chapel, Windsor Castle
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A member of staff holds goodie bags ahead of of the wedding of Prince Harry and Meghan Markle
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A Royal fan waits for the wedding ceremony of Prince Harry and Meghan Markle at St. George's Chapel in Windsor Castle in Windsor, near London, England, Saturday, May 19, 2018. (AP Photo/Frank Augstein)
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Royal fans within the grounds of Windsor Castle ahead of the wedding of Meghan Markle and Prince Harry.
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Royal fans gather behind the barriers on the Long Walk, in Windsor, ahead of the wedding and carriage procession of Prince Harry and Meghan Markle in St George's Chapel at Windsor Castle.
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Royal fans soak up the atmopshere during the wedding of Prince Harry Harry to Ms. Meghan Markle on The Long Walk
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A man sweeps the path outside St George's Chapel in Windsor Castle ahead of the wedding and carriage procession of Britain's Prince Harry and Meghan Markle in Windsor
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Two men wearing wedding dresses buy train tickets to Windsor to watch the Royal Wedding of Prince Harry and Meghan Markle at Waterloo train station
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Crowds gather during the wedding of Prince Harry Harry to Ms. Meghan Markle on The Long Walk
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Well-wishers draped in a Union flag with an image of Britain's Prince Harry and his fiancee Meghan Markle walk along the Long Walk leading to Windsor Castle ahead of the wedding and carriage procession of Britain's Prince Harry and Meghan Markle in Windsor
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Royal fans line the Long Walk in Windsor ahead of the wedding of Prince Harry and Meghan Markle
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“I believe it came about when the Prince of Wales [George II] did not want to have the godparent for his son that his father wanted - so George I got Parliament to come up with something.”
This means that when Charles, Prince of Wales becomes sovereign, he will have custody of his minor grandchildren.
According to Koenig, issues surrounding the law arose in 1994 when Diana, Princess of Wales separated from Prince Charles.
Diana expressed wishes to take their sons, Harry and William, to live with her in Australia, but couldn’t due to the regulations laid out by the custody law.
An annual register published in 1772 goes into greater detail explaining the details of the regal ruling.
“They said that the opinion of 10 judges, in the year 1717, was a confirmation of the legality of this prerogative, which admitted the King’s right to the care of the marriage and education of the children of the royal family; and that the late opinion acknowledges, that the King had the care of the royal children and grandchildren, and the presumptive heir to the crown…”, the register outlines.
While the law indicates that the Queen legally has custody of her minor grandchildren, Koenig doesn’t believe that she would ever feel the need to act upon it.
“I would doubt that the Queen would interfere. [It’s] more of a formality,” she says.
“I think the Queen has let her children raise their kids.”
Last year, it was revealed that a law that states that only sons can inherit hereditary peerages was being challenged in the European Court of Human Rights.
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If the law were to be changed, this would mean that a daughter born to Prince Harry and Meghan would inherit a royal title, whereas she wouldn’t have been granted one before.
“Under the current system, any child of the Duke and Duchess won’t automatically have a royal title,” royal commentator Richard Fitzwilliams explained to The Independent.
“The peerage, unlike the succession to the crown, favours males and if they have only daughters, the title of Sussex could die out as it did before."
This article has been amended to reflect that the sovereign has custody of their minor grandchildren, not great-grandchildren.
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