“In an analysis of about twenty-four thousand children across nine mostly Anglo-Saxon countries, about 3 percent were found to have been fathered by a man other than the presumed father. That means that about one out of thirty men was unknowingly raising someone else’s child …”
quoted from A Billion Wicked Thoughts: what the world’s largest experiment reveals about human desire by Ogi Ogas and Sai Gaddam
Six generations back every one of us has 32 great grandfathers. If you draw your family tree past the sixth generation, chances are you’re beginning to or already are running down the pasts of men not related to you.
Does this statistic include the artificial inseminations? I guess sperm banks don’t go far back. But there’s always been adoption. And it’s not always been something people have talked about.