Family issues with wife

Sir, one of my frnd had married to a divorced women years back and after the 1st month of marriage his wife had started fight with him because of family members and making unnecessary issues and blaming his family. She is continue is touch with her own parents to take advices and they have helped her in a very good ways. She also tried for fake suicidial attempts to make pressure on he4 husband and after 2 yrs of marriage they finally have a child but still the fights continue. Even in last year my frnds parents given her one seperate floor in the same building with a thought that might be fights and her issues will be solved and she will live happily after but No she is still fighting for unnecessary reasons. Sir my frnd and his family is in very big trouble even my frnd is thought to do suicide because he is not able to handle the situation because her parents are taking full control on his wife. Please suggest what the best legal actions can b taken by my frnd or any of his family members.