What are the men's right in a marriage?

I am asking this question for my brother as my parent's are old and retired and my brother suffer's from temporary memory loss issue which he developed after a brain hemorrhage and stroke he suffered in 2013. He was working as IT professional till 2016. In short I can tell that we have evidence that his wife took away all his money including PF and Gratuity. She is also holding one property and earning rent on it which is bought by my brother on his name through a loan he took. She held him against his will for 2 yrs at her maternal home while we kept knocking every possible door to help us including women's commission of India. But none action was taken against her. Recently due to extreme torture and harassment my brother ran away from there and managed to reach us. We filed a police complaint against her but again none action was taken and police did not convert it into the FIR. Now after 3-4 months she sent my brother a divorce notice stating he did mental and physical torture to her and they gave us 50 lakh cash in dowry which is a white lie.Now she wants that 50 lakh back.