From 23andMe, our family learned that 3 of 4 siblings have different fathers who aren't our dad. (We already knew that was the case for the youngest.) This revelation sent me for a second look at my Ancestry.com profile, which I'd done several years earlier; the first match turns out to be a half-sister. Our nephew, via the same pathway, has found a 1st cousin once removed, and is on the verge of learning the identity of his birth grandfather. Eldest sibling is awaiting the results from Ancestry.com. We are 65 and 71. Two siblings passed last year, parents all gone.