I have never been so uncomfortable in my whole life!

My sister is getting married and me and my husband went to meet her fiancè's side of the family. Her fiancè is great! No problem there.... But his family... His brother and sister were making incest jokes...the first 3 may have been funny but after that it just got uncomfortable... His sister for real said "If he wasn't my brother I let him hit this pussy!" And his brother said "Fuck yeah!" And bit her tittie! Then she laughed and said "Just kidding!" And she stuck her ass out and his brother slapped it! My husband says"I'm frightened..." Same babe... Same... It was like that a lot and his sister was sitting on his brothers lap and he said the nursery rhymes from the grown(had to Google it to remember the exact words. It went "It was a young lady named Sally, who enjoyed an occasional dally. She sat on the lap. Of a well-endowed Chao. And cried sir, you're right up my alley! It's about sitting on a guys lap and his dick slipping in! He laughed and tickled her and I was ready to just go! Then his sister said to my husband she went scrolling through his Facebook. My husband said "Ok?" She goes "Does your wife know you were with a man before her." Before he could answer I said "Yeah I did." She says to me "So are you his fag hag or something." My husband got up and said "Sorry but I just realized I need to get the fuck out of here." And walked to the car. I told my sister goodbye and she looked humiliated. I'm not looking forward to these people being family...

Edit: My sister's fiancè did reach out to apologize. He said he called them out for calling me a fag hag and that his brother and sister are just really close..... There's close and then There's whatever TF that was...