For most of us, we had very little to do with selecting our ancestors. You know, the ones that came before us. The ones from who we are descended. They have provided that chromosomal material called DNA which make us unique among the worlds population.
Webster defines "ancestor" as "one from whom a person is descended and who is usually more remote in the line of descent than a grandparent." A great-grandparent and beyond it would be. Not many of us ever met our great-grandparents in person. Perhaps there are family items that have been past down through time to us that were part of their lives, but we still carry a portion of their genes as we walk around this earth. A family we are from the beginning of time...a common thread indeed.