My dad did something truly awful 20 years ago, my mum should have kicked him out but didn’t. I left home soon after to go to uni and never returned permanently. I didn’t want to be estranged from my mum and sibling(who was also firmly under the regime) so I played happy families when I saw them. Fast forward 20 years, dad’s done it again, family has broken up this time. By this stage both parents are elderly and have needed lots of support with logistics of separation and moving, most of which has fallen to me. I’ve supported both and made sure each got a fair deal. Now that’s sorted, I can no longer stand to be around dad and I can’t/wont have him round my kids so without making any major statement, I’ve stopped talking to him. Mum is still obsessed and talks about him constantly. Sibling still sees him regularly. Dad is now trying to manipulate the situation by disinheriting me, it’s fine if he does but I’ve gone non-contact with him to get him out of my life but my mum/sibling are constantly mithering on about it now and I feel like he’s more at the front and centre of my life than he was before I stopped talking to him. How do I make it stop?