i'm curious. is everyone related? i found out today my wife and i share an ancestor, 11th great grandfather for her and 13th for me. can any european descended person find relationships like this? we both have 23andme data and don't match at all. i saw that it's a genealogy game to trace random people to Charlemagne, between 30-40% of europeans can. i did that in 40 generations for both my wife and i, for grins and giggles.
so, take any two random people, statistically can you usually find a common lineage in 15, 20,40 generations?