I know two people who found very close relatives through Ancestry.
One of them signed up and a woman emailed him saying she was a 1st cousin. So he emailed his 5 uncles about it. They all got mad at him saying he sent an inappropriate email. LOL Not sure what happened after that.
It happens quite frequently. Chickens are coming home to roost, so to speak, people are finding out about secrets and lies. They can deny all they want, but the DNA speaks for itself.