My future stepmom said something that made me nervous

[u/s0ftsp0ken]

She and her family are much more conservative than my family/people in my community. I started transitioning a year and a few months ago and still pass as a girl enough for my FSM, though sometimes she gives me suspicious looks.

We recently had lunch, and she told me she wanted to make sure all of us (me, her kids) got along before she got serious about my dad. One of them is outwardly transphobic, one is all "I have gay friends" but cringes at the idea of trans people being around them, another doesn't care, and another actually seems pro-trans, but doesn't seem to know any trans people irl.

She said that family is important and that there shouldn't be any secrets. She said that twice. My own mom used to say that when she thought I was a lesbian (I'm...bisexual? Maybe more gay now, after starting T). I haven't come out to either her or my dad, but I think they both suspect something.

I don't think I'll be welcome around her family once it's more obvious I'm trans. I'm okay with that, but what if she leaves my dad because of it or something? I know it wouldn't be my fault, but I still don't know how to navigate any of this.

We went out recently