Harassment by wife on husband and in laws what action can we take

Respected Lawyers, i'm here to get legal advise on this serious issue my family is facing. My younger brother got married 7 month ago. For past four months his wife is mentally harassing all my family members and threatening to file false cases against us. My mother is having brain tumor which causes her brain Seizures. My parents needs to visit AIIMS three or four times a month for treatment but She didn't care anything about it. She is misbehaving every single person of my family, she fights ,yells on my mother for every small issue each and every day , sometimes she fight even all night. Due to this disturbance , my parents are not able to continue their treatment. It's a life threatening situation for my mother. My parents had decided to shift her and his husband to different house but the problem is .. she is not living happily with her husband too, she is also mentally harassing her husband, fighting , yelling on him almost each and every day to such and extent that my brother tried to suicide. my parents are very decent and she is taking advantage of it , now she is more and more harassing us. we don't know what to do.