I suspect that many of us who fill out these family trees will wind up with male ancestors who we are not really related to. It is probably safer to trace back female ancestors but many adoptions went undocumented years ago. Now if we could just get DNA samples from everyone.
I am curious just how far back one can reasonably trace their genealogy before there are just no records. 500 years? 1000 years? How far do most people get?