Sir: Barbara Muir (Letters, 19 July) makes the point that a child born to a lesbian couple by donated sperm is deprived 'of the love and influences of its paternal grandparents'. What is so special about paternal grandparents? The child would have two lots of grandparents, and that is what matters. It might even have three lots if the couple were on good terms with the donor.
The writer is a great-grandmother.