My (short) work deals with my transition from male to female. Nothing offensive in it, except for one or two swear words. It's autobiographical (obviously), and I hope it sheds a little light on why some of us do what we do. Why we suffer social isolation, loss of friends and family, simply so we can be who we were meant to be.
I've had a niece (by marriage) who is now a nephew. The family went through a lot, just as she (now he) did. That said, don't give up on your family. It is hard on families in ways that mirror what you probably felt before you made your decision (e.g., confusion, pain, etc.). I haven't read your book but it's a great way to tell your story without forcing your rationale on people. Give your family time to absorb it all. Don't ever expect complete approval, as there will always be memories that surface from time to time (don't take the name thing personally, they'll screw it up more than you care to know). Instead, rejoice in the little things you'll see as they start coming around - some will sooner than others. Give them space to adjust and show them love throughout their transition. Putting it in writing, is a great start for you and them.
About me - I write about (various kinds of) real love and the sucky things people go through before they find it. Your story hit a nerve (not a bad thing). Sorry to preach.
The interesting thing is that my wife's family has been completely accepting of me. And finally, after three years of silence, my dad sent me a card ob my birthday. He said he still isn't okay with it, but he apologized for any pain and hurt he may have caused me.