Growing up I had minimal relationship with my eldest sister; she’s always been self centred and bullied me. She’s also always had strained relationships with the other sisters, and most of all my mother. On the other hand, me and my mom are SO close. Into adulthood her and I (along with the other siblings) got closer. Even my mom and her had a really positive relationship and my mom was a great grandma to her kid. But a while ago, seemingly out of nowhere my sister started a massive fight with my mom and has now completely iced her out of her and her kids life. Literally pretends she doesn’t exist. I feel for my mom. She’s completely heartbroken. She’s tried to give her space, tried to ask if there’s anything she can do… And in the meantime it is so awkward for me being invited to my sisters and her kid’s events and my mom being left out. Anyways, I recently had enough and told her if she can’t even be civil with my mom (say hello, acknowledge her as a human being…) that I simply could not have her present at my wedding shower or wedding, or any other events where I’d reasonably invite my mom. It’s not fair to my mom and frankly, having the two of them in a room with that kind of awkwardness and seeing my mom’s heartbreak ruins my day, too. AITA for kind of cutting her out of these events and keeping her at arms length? I’ve tried talking to her about her and my mom’s relationship, trying to understand, and she refuses, simply saying “we are not talking about this” “stay out of it”.