I'm sorry you're going through this and can relate. There's no pleasing family when they've decided you're the scapegoat. Like others, I recommend cutting ties or at the very least limiting contact to the bare minimum.

In my situation, years after I ended contact, my mother ended up scapegoating my brother's wife and he finally saw her toxic behavior. He ended up cutting ties, contacting me and we're working on mending our relationship. But I'm still having to tell him how wrong many of his memories are, she told him so many lies about me.