I didn't click a survey selection as I don't actually know if anyone in my family is or was clinically diagnosed, due to both long estrangment and also, back when I did know most of them, people kind of didn't even bother to pursue help or diagnoses anyway.
There was a great uncle of mine, at least I think that's what he would be -- he was my grandfather's brother. He was quite severely....something.....nobody ever named it or said what he "was" or had. I suppose he was what people used to call the R word even though back then it wasn't an insult at all, and was just what people named people who were developmentally different or challenged. My great uncle was very clearly what used to be "the R word." I don't know anything more detailed about how or why. My grandfather looked after him but I think he also had times in some type of care home.
The time period was in the 1960s and going back much further, as they were both born in the late 1800s. In the late 1800s and the early 1900s, people "kept it in the family" and often didn't even see a specialist or get diagnosed with much. They just looked after family members who were "different."
Both my parents exhibited elements of high functioning autism but it's impossible to say for sure, and they're gone now.
I also have a first cousin whom family members used to be concerned about when he was a child, teenager and young adult. Again, nothing clear was said, and again it was the 1960s, a time before enlightenment.
He wound up actually doing very well for himself so who knows, maybe it was all nothing, but looking back with what I know now, some of the concerns about his younger self seem now to me like HFA.
My sister's eldest daughter seemed (now, in retrospect also) very on the spectrum, again completely unrecognized back in the 60s. She too now is "better" than she was but she too is someone I remember vividly from childhood as having very HFA issues or even level 2 back then.
I have been estranged from all these people for decades now, and I have no idea if maybe even someone has in fact been diagnosed with anything; they don't know that I have been, and I don't know what's up with them lately either.