The genetic gender stuff is really fascinating to me right now. Partially because how little it’s talked about, and partially because how common it seems, which makes the first part even more interesting.
I don't know of any trans people in my biological family (granted, I'm not close to most of them; I only recently met some of my half-sibs a few years ago). My brother is a bit GNC but pretty cis. But I wonder about my mom (whom isn't blood related). Kinda suspect she'd be in the agender-spectrum, but she also unfortunately listens to way too much "conservative" sources and can be bit transphobic at times and since she doesn't care about things like pronouns, she's also not good at using trans people's correct pronouns.