Advice in daughter's right to claim over ancestral property.

My father died intestate in 1981, leaving my mother, 2 unmarried sisters and 1 son (myself - youngest in family). We have an ancestral house, received from my grandfather, and it was divided among the families of his two sons(my father and chacha) equally, alongwith appurtenant land through a family partition in 1998. All members of my father's and chacha's family were part of this partition deed, including my sisters. My eldest unmarried sister died later in 1998. My younger sister was married in 1991. After this partition, we sold a part of our land after partition in 2000, and in its registry we showed her as a shareholder alongwith my mother and myself. The proceeds of this sale were equally shared. Now we want to sell house with remaining appurtenant land, but my sister is asking for an equal share. Please advise, as life long I have been catering to all family requirements through my salary, meeting obligations. I am 48 yrs and has a son. We are Hindu. What is the remedy in law?