A friend of mine once hooked up with a guy she matched with on Tinder. She was in a different city for a family reunion, and hooked up with him two nights in a row, since she decided to stay there a couple of days before the event to check out the sights.
You guessed it. Come the day of the family reunion, and guess who's there? The Tinder-guy, who she quickly learns is her cousin on her father's side. She had never met him before. They both kept their cool for most of the event, but then his brother got too drunk and started gossiping to people (Tinder-dude had confided in him). The whole thing ended up with her and her parents leaving early, her mother in tears.