How to get Divorce from wife

My younger brother and his spouse have irreconciliable differences and have not been on good terms with each other for over a decade as per hindu traditions with consent of both families. This marriage was solemnised on 16th May 2005. Both have 2 children. A daughter born on 19th March 2006 and a son on 8th Dec., 2012 (during separate living). My late father who expired on 4th Dec. 2014 had been supporting my brother and his whole family until his death despite abusive behaviour of both my brother and his wife not only towards each other but also against my parents. My mother after death of my father has been out of her pension supporting my brothers wife on monthly basis for her and the children's survival as my brother doesn't provide for them. Immediately after my father's death my brother has been asking for divorce from his wife who has refused stating that unless entire half of all property is given to her or in children's name she would not give divorce. she is living with both kids at Nagpur. This is a only a brief of case. I need professional help.