Your brother should shift to separate flat with his wife
2) it would insulate your parents to some extent in case wife files false cases of dowry harassment , Domestic violence against them
3) further she would not be able to sleep the whole day and would have to take care of the house
4) visit a family counsellor to resolve the differences
5) only if wife in her statement mentions that your brother harassed her and she attempted suicide would your brother be in trouble
6) he can apply for and obtain anticipatory bail from sessions court in case false case is filed against him for abutment to suicide