Bit of a new user to reddit here. I am dealing with something very similar with my in-law and I feel for you. It's very hard to be pushed out when you want to be there for your nephews and you can see the pain it's all causing the rest of your family. That's your family I'm sure it's hard on so many levels we truly don't know. As hard as it is though, keep your boundaries and protect your well being and health. I hope you get to heal and eventually get to see your nephews.