Remember this perennial thread from the old TuD site?
@buckly–you might take some comfort from the hundreds who weighed on that topic. In my case I have a huge extended family–dozens of first cousins with their own families as well as my 5 siblings and their families. I know of only one other person with T1 (my cousin’s daughter). There are some cases where it tracks in families like T2 tends to do, but the general rule is nope. So I wouldn’t waste a lot of time worrying about it.