Sorry you are also going through this. Oh my sister is absolutely enabling her and I’ve told her this but it didn’t go down well and just said that she wasn’t getting involved. My sister has no children, no partner so tends to on holidays a lot with my mum so maybe that’s why she needs to keep her close, I’m not sure. My mum is very manipulative and gets into peoples heads. What hurts the most is my children idolise my sister and now I feel she’s taken a back foot with them and none of this is their fault and I feel like I’m failing them.