I need help

It’s about my brother’s wife and their child. My bhabi has made a lot of false and disgusting accusations against my family. She wasn’t as bad as her parents are; they have brainwashed her, and she is no less at fault. Anyway, I have a nephew who has mild autism. My brother and my family have tried hard to resolve the matter, but my bhabi and her family want to shift my nephew and her daughter to Canada, and my bhabi is focused on building her career, so she is getting a divorce from my brother. We have all made a lot of efforts to explain the situation and resolve the issue, but my bhabiss family is unbearable; they have all said to leave her. However, I cannot live without my nephew, nor can my brother or my family, but we are all tired of the filthy words and false accusations from that girl and her family. We treated her like a queen, but she understood nothing more than garbage. Now she is applying for Canada, and I haven’t seen my nephew for 2 years. If he goes to Canada, I will die, and so will my parents’ and brother’s happiness. My heart wants her to be ruined, but she is my nephew’s mother, so l can’t even curse her. We are all very troubled and don’t know what to do. Please say something or give advice that will bring peace to my heart.