The number of people who have mailed in their saliva for genetic insights doubled during 2017, reaching a total of more than 12 million. Most people are curious where their ancestors came from. A few are interested in health. Some are adoptees or children conceived from sperm donation who are explicitly looking for their biological parents. DNA testing companies like 23andMe and AncestryDNA regularly tout happy reunions on their websites.
But not all biological parents want to be found. In conversations and correspondence with more than two dozen people for this story, I heard of DNA tests that unearthed affairs, secret pregnancies, quietly buried incidents of rape and incest, and fertility doctors using their own sperm to inseminate patients. These secrets otherwise would have—or even did—go the grave. “It’s getting harder and harder to keep secrets in our society,” says CeCe Moore, a prominent genetic genealogist who consults for the television show Finding Your Roots. “If people haven’t come to that realization, they probably should.”
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