So my sister(let’s call her B) is getting married October 2026. I absolutely hate her fiancé(let’s call him A). He is a terrible person. For example when we went on a family vacation(to spread my dad’s ashes) my son was 11 months old, it was near his nap time and he was crawling around. Well my nieces and nephew were running around and my son was following them. My niece brought me my son and was like “he was following us but I’m scared he will get hurt”. So I took my son and A literally said “if you can’t control your fucking son you shouldn’t have came”. Mind you my son was 11 months old and was just following his cousins. I ignored A’s comment because I didn’t want to start anything. On the same vacation he would get so pissed off about my son crying and make comments about how he was annoying. A has 2 kids(7 and 13) but he wasn’t around them when they were babies. Before all of this when I was pregnant I wasn’t working(high risk and my job shut down due to tornado damage) he kept telling me that I used my pregnancy as a form of disability. Which isn’t true. I tried to go back to work when my job reopened I was 7.5 months pregnant but I went into preterm labor and was put on bed rest. When I try to explain to him that he rolled his eyes and said “yea whatever”. The whole time my sister is defending him. While all this was happening my 16 year old niece(B’s oldest from a previous relationship) doesn’t even like him. When my niece told A he wasn’t her dad and to stop trying to parent her, he took her computer monitor and told her to not talk to him that way. I get he’s the only “father figure” in her life but the only reason they got into an argument was because A told my niece she was ungrateful because she didn’t want to go out to eat with them. B literally just lets him say or do whatever he wants to her 2 kids. Back to the wedding, I really don’t want to go. I know that sounds awful but I hate this man so much. My son is going to be in the wedding which is the only reason I’d go. I even told my mom that I didn’t want to go. If she wanted to take my son and they go that would be fine. So WIBTA if I didn’t go?