Jane Godwin 
Family Tree [EPUB ebook] 

Harry’s real name is Harriet, but no one ever calls her that. When Harry is nearly eleven and her stepbrother moves in, everything she cares about starts to change: her family, her school, her home. Now, Harry finds herself looking back to see where she’s come from, to work out who she is. Is she really Harry after all? A very special story about a girl who looks like a boy, a child who feels like an adult, and a past that refuses to stay there.