Can you use just one of the airline tickets of a return booking?

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Q Our family is going to the US this summer. Our 15-year-old daughter is travelling out separately with her school and travelling home with us. She is on a group booking with the school for the outward journey (they would not allow a different return date), but I have booked British Airways return flights starting at Heathrow to the US for myself, my wife and our daughter.

Our daughter will not be using the outgoing part of the booking I have made and she will not be using the inbound part with the group. Should I let the airline know?

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