I read my daughter's diaries the other day. Let me share with you. You may think you know pretty much what's going on in your own family. Believe me, you do not.'Sappho was so happy when she married Gavin. She was in love and it seemed that at last everything was falling into place. But she hadn't considered his daughter, Isobel. She is a delightful, charming girl who spends her school holidays ca...