I came across a useful feature of Wikitree yesterday; I was updating the Biography of my first cousin Pat, who died yesterday. Rest in peace, dear cousin. New DNA Clue Before I left her page I noticed a new name on the right, where DNA Connections are found. I've blurred the name of my new-found relative, but this is what I saw:  Search for a Match My first step was to search for him on 23andMe -- not found. Then, a one-to-one comparison on Gedmatch -- no shared segments. Nor with my sister, or another first cousin either.  How about with my uncle? Yes!  35.1 cM , quite a healthy segment for a third cousin. One to One Gedmatch comparison between my uncle and his Baysinger match Find Common Ancestors Next step: check the match's tree. His parents were private, but his grandfather's name was familiar, and in my own Ancestry.com tree. As I examined our two ancestral paths back to our common ancestor, an important aspect became clear: we share only a single ancestor, no...