My sister and her brother-in-law are at odds. What should I do?

1, first understand the reasons for their embarrassment'

Secondly, are you a brother or a sister? If it's a woman, you can tell your sister. Generally speaking, in both husband and wife, the woman is prone to kink emotionally, while the man thinks the woman is too aggressive and emotional. So as a brother, you can talk to your brother-in-law directly. As a sister, talk to your sister.

3. Determine the wrong party. If your sister is wrong, you can apologize for her, or ask her to apologize directly and invite them to dinner.