I can't help with therapists as I'm in the UK, but I also have a similar thing with my parents, so I just wanted to tell you that you're not alone.
I came out to them through a mutual friend about two years ago now, and although we spoke about it a little bit at the counselling sessions I was going to at the time anyway, when I managed to escape them (they were terrible for my mental health) we never spoke about it outside of there, and so never spoke about it once they'd stopped. Last year they saw that I was reading "Sacred Country" by Rose Tremain (a fiction book about a trans man) and I worried that it would be brought up again, but they still never mentioned it. I'm at the point where I'll need to tell them that I've been to my GP again and I'm trying to get referred to a gender identity clinic, but I no longer live with them. I'm putting it off because there's never a good time, I see them so rarely, and they don't understand either. I was told that it's okay to just act masculine, why did I have to be a male as well (one of the benefits of masculinity in females being more acceptable than femininity in males I suppose), but that's not enough for me, it doesn't cure my dysphoria.
I wish you all the best, and I think that seeing a therapist is probably a good idea, after all my thinking is that if I see a gender identity clinic and get "proof" that I'm trans they're more likely to believe that it's not just a massive pretence like they reckoned the rest of my MH issues were.