AITA for not wanting a relationship with my SIL for cheating on her second husband after doing the same to her first? My SIL is a very manipulative attention seeker. She's 37 and on her second divorce. My husband is always trying to get me to do things that involve spending time with her but I don't like her as a person and never have. I tolerate her for the sake of my husband and all the kids. She has 2 kids from her marriage that's about to end and I adore them. She ended her current marriage and is now in a serious relationship with a man she met at work. She's trying to make out it happened after they'd split but there's clearly and overlap. She met her last husband at the gym while still married to her first husband. Again that was clearly a relationship while she was still in a committed relation with her first husband. She's painted herself as the victim in both these relationships but both were good men. She has my MIL running about constantly taking care of her kids, even more so now to spend time with her new man. My MIL has a lot of health problems.We don't share the same morals or values and she's a classic narcissist but I feel like her family are blinded to what she's really like. Her last husbands family disowned him because of the way she treated them and a few of my close friends have met her and took and instant dislike to her. My husband can't see what's wrong with her and is pushing for me to go and visit her and I just can't bear being in her company. I do make a point to see her kids and spend time with them and really enjoy having them stay over with our kids from time to time. I've said to my husband I'm happy to tolerate her at family gatherings and stuff but I don't really want any sort of relationship with her. It causes arguments sometimes and I get frustrated that my husband and my in laws take get suckered into her whole 'poor me' victim act.