Being tortured by Bhabhi (Sister-in-law )

Hi, It has been 1.5 years since my brother's marriage and we are Hindu. They both live with my parents and I join them occasionally. My mother is a severe ILD and asthma patient and father is the patient of stroke. Brother works in govt. bank as assistant manager. My bhabhi mentally tortures us all. She creates scenes at home and starts shouting at us all when my mother or brother say her even a single thing. She is the kind of person who never ever heard anything against her even by her mother and father.My parents are even bearing the cost of her B.Ed. and she behaves like this with us. My parents are humble and kind people and have always supported her. My brother wants to give divorce to her but the 'LAW OF MAINTENANCE' stops him as we already don't have much income. We are also scared that her family might accuse us of fake dowry and domestic violence charges. We are terrified of her! PLEASE KINDLY SUGGEST SOMETHING.