Family harmony is most important. Don't go to extremes easily. After all, we are family. If we can relax, we can relax. Anger only hurts our stomachs. If we can vent it in some way, we'll be fine. After all, it's no worse than wearing enterotoxin. The family really hurts each other. No matter who is right or wrong at first, the whole family is a victim and there is no winner.
If your mother has another place to live and your brother's sister-in-law has no other place to live, it is unwise to take back this suite. This in itself is a problem that hurts feelings. Feelings need to be cultivated. For the time being, the two sides can't cultivate together, at least not hurt together. After the injury is exhausted, there is no third way except to get rid of my brother's family relationship or after my brother's divorce. Where are your brother's children? What about the rest of your brother's life? It's all a question. It's not that simple.