You know a lot of parents have a history of doing this thing with telling the kids everything. And a lot of them always bad mouths the other parent. I know these feelings all to well. My mother passed when I was just 15, and my dad and his wife at the time still continued to inform me about my mom. My mom also did it. I would just tell anyone out there who is going threw this that you don't want or need to here about their issues. If my parents were still alive I would tell them this. So, next time your mom talks about X, just tell her that I'm really not interested. Hope this helps.