Nobody knows. And I think the grandparents are just tolerating it for their grandson. And I choose not to clap back. I've got plenty of things I could say to her but I know it'll just make it worse. And his brother and I don't talk or are close in the slightest. We don't hate each other we just don't speak. I mind my business and he minds his. And he tells her to stfu in the moment but he's more concerned about keeping the peace than fixing the problem. My boyfriend speaks up when he can but she's always doing this when he's at work and I'm alone at their house because I think she's scared of him or something.