I took one of those online tests that tell you about your ancestry. I did it because I was curious about where my distant ancestors came from - but I found an unexpected family match.
It looks as if my grandfather had a son nobody knew about, who grew up and lives in America. I googled his name and saw photos, and there's a very clear resemblance. He also has a Facebook post saying he wants to connect with his dad's relatives.
I don't know if he was born through a previous relationship or infidelity. Both my grandparents on that side died some years ago, but my dad and his siblings would obviously be affected by knowing that this half-brother exists! They're all in their 60s.
I don't know what to do. I could just make my page on the website private and carry on as if I'd never seen the match. Or I could tell my dad about it, and risk stirring up negative reactions or family secrets.
YABU - don't tell him, you'll be causing drama for no good reason and people will get hurt
YANBU - tell him, he has a right to know even if it's a shock