I also have had less than what I expected, in terms of questions, etc. from family members (and the close friends that I've told, for that matter). I had mentioned this in another thread and, at the time, I put it down to people simply not knowing what to say. Upon more reflection, I'm wondering if it's because they are equating gender with sexuality. Most people are very hesitant to discuss sexuality, especially with family members.
In my family's case, we never talked about anything, let alone sexuality. It would be unheard of. This lack of questioning re: my gender transition is just a continuity of that hesitancy, in my opinion. That being said, I've noticed a distinct difference regarding the subjects that my mother will talk to me about since I've begun my transition. Stuff that she would never have discussed with me before I told her that I was female. Same difference with some female friends. I feel like I've begun to cross a threshold where they no longer perceive me as a male that they have to be guarded around. I'm beginning to feel like I'm being accepted as "one of them" - and it's a glorious feeling!