Ancestral property share grandfather is catholic sale deed exists

My grandfather a roman catholic bought a land on which existed a house. The sale deed exists for this on his and his mothers name. On the same land he built a bungalow next to the existing house. He had 1 brother and 1 sister. In those days when the surveyor came to survey the land, in the absence of my grandfather, the brother told the surveyor that half of the land belongs to him. The property card thus has the brothers name included along with my grandfather. My grandfather has 5 children, his brother has 4 children, and the sister has 2 children. My grandfather and his wife, the brother and his wife are deceased. Who gets what share in the land/and or the houses on the land?