I'm abroad on long weekend with DH for a special occasion. Asked DM to have kids whilst we were away which she agreed to do as long as my sister helped out. Kids are 6 and 4. We left Wednesday night back Sunday. Kids have in school thurs and fri.
Find out that DSis invited a new man she met on tinder to dinner at my house on thurs night. They met 14 days ago and she really likes him. She never mentioned that he was coming or would be meeting my kids.
Just found out he stayed overnight too with my kids and mum in the house. DH is furious. He has told DM over Skype and there has been a big fall out. DM and DSis think they have done nothing wrong and we are overreacting. I don't know this man from Adam. AIBU?