How to comfort sister-in-law when she is angry with her?

First ask why you are angry, and then ask your sister-in-law to apologize. When comforting your sister-in-law who is angry with your sister-in-law, you can first ask her why she is angry and find out that it is her sister-in-law who does not do housework. Then ask your sister-in-law to apologize to your sister-in-law and promise to share a certain amount of housework in the future. If anything happens to you and your sister-in-law, it is her. If you don’t want to do housework, I will remind her to share the housework in the future.