What should I do if my brother and sister-in-law are in conflict?

You can think of my home like this, which shows that you have a good relationship. I suggest that both parties should do this kind of housework. First of all, you should give your brother a general job so that he can relax in these things. Men should not always create family conflicts for these little things. If there is anything, you can communicate with your sister-in-law and let her slowly change this way of disciplining children. Besides, it's not an emotional issue, so it should be easy to reach an agreement. In addition, I also want to tell your brother that your sister-in-law is right to do so for the better growth of her children. At the same time, take the initiative to communicate with your sister-in-law and tell her that your brother didn't handle this matter correctly, and it is correct for you to educate your children. Your brother realized this, but he was embarrassed to apologize to you. He'd better give your sister-in-law a gift, just say it's from your brother, so that your sister-in-law's psychological problems can be overcome. Of course, the premise is that your brother must do a good job.