Jack, you said...
So, you are asking this question to a biased crowd...expect a biased outcome.
I quite agree. One must always look at the pool from which survey participants are drawn to try to understand potential issues with selection bias. I'm quite sure our self-selected pool of those forum members who take the time to post an answer has some sort of a profound bias baked in.
Thing is, I'm not sure which way it would run. Are we more
likely to see a family history?