Thanks to the innovative and ever-developing technology of the modern age, learning about where you came from is as easy as spitting in a cup.

Genetic tests revealing your ancestry and personal health-related information, such as the “23andMe” DNA test, are just a click away for consumers interested in examining their lineage — no health care professional needed. That’s why a lot people take them just for fun. But as described in these 12 testing stories, a person’s results can reveal seriously uncomfortable truths they never expected to face.

1. “My mom did 23 and Me this summer, it came back saying my uncle was only a half uncle. She asked family friends and it turns out my grandmother had an affair and passed my mom off as her father’s kid — a fact that my grandmother clearly intended to take to her grave but science caught up.” — reverendexile

2. “In my genetics class we do a blood typing lab and our teacher told a story about her first year doing it where there was a girl who had a blood type that meant her dad couldn’t be her actual father and the mom (who also worked at the school) got caught cheating.” — Xzeener

3. “A former coworker of mine took the test and found she had a different father than her sister and neither were related to their father. She decided to confront her mom about her infidelity. She found out that her mom and dad were into group sex and that the biological fathers could be a number of gentlemen.” — MTGothmog

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