Rights of a widow

Sir, I am a 20 years old man.I have an elder brother. My mother is a widow.My father died 8 years before and since than my grandfather has exempted my mother from any financial assistance.Regarding the dispute we went for arbitration often. But my grandfather doesn't obey the decision of the arbitrators.My maternal grandparents are looking to my mother's need past these years.Due to his AGE the arbitrator confines to take any strict action against him. After so many pressures from the prestigious personalities of the society he agreed upon paying education expenses of both of us.But due to incapability of helpness from maternal grandparents it has become necessary to restore the rights of my mother.she can hardly manage her basic expenses.we cut some amount from the money we get for studies.My grandfather had 2 son and a daughter.Elder is the daughter who is married.Than my paralyzed unmarried uncle who died couple of years before.Than my father.We tried a lot but nothing productive happened. Suggest us a feasible solution. WILL BE ALWAYS THANKFUL.