I know there is 2 sides to this which is why I wanted opinions, my sister has an emotionally abusive partner, he’s never hit her as far as I’m aware. He calls her a cunt, bitch, slapper, whore, made her had sex with him after she had a hysterectomy, he’s had an affair, he’s made comments about my niece saying oh you are just making want to have an affair but (neice) will sort me out she’ll give me a blow job. Various nasty comments about me, as he knows I’m on to him, unfortunately he has managed to pull my sister away from me too. My future husband can’t stand the guy and I suppose I’m worried with alcohol flowing there may be some sort of fight later on. I feel very uncomfortable around him, we don’t want him at our wedding but is the right thing to do invite him for my sisters sake, I’m all over the place with this, what would you do?