How to help my sister scold her brother-in-law

Sister must be self-reliant and car-scrapping. So you can talk to your sister more and let her know that women can stand on their own feet, and now women can hold up half the sky. Only when your sister realizes that she can be strong can she become her own hero, say no to her brother-in-law's bullying, stand up and boldly fight for her due rights.