I understand completely. My parents think that because they gave me that name, then that is what I shall be called forevermore. I came out to them six months ago and they still can't wrap their head around it. Once the initial shock wore off, my mom told me, "Well, your father and I discussed it (dad and I are practically estranged) and we decided not to disown you. I don't think I can ever bring myself to call you Jill, so don't expect it. You will always be Greg to us." Gee, how about "We love you no matter what and just want you to be happy." Nice, huh?
Anyway, they haven't seen me since last Thanksgiving when I had a full beard. I don't look remotely like a Greg anymore, so we'll see what happens. If they are less than civil this Thanksgiving, I may just end up disowning them!