Please help me with the question of disputed property. This is a land at a prime location in Pune. Its in the name of my grandmother who expired in 1993. She had 2 sons. The elder son is my father who has been staying in Mumbai. The younger son has been staying since beginning with my grandmother i.e. my chacha. Now my chacha is trying to sell off this land to another builder on condition that he will get a share in that building which is constructed on my grandmother's land.
How can he construct building on disputed property of grandmother. Even we have a share to this land. What actions can we take against our chacha & the builder who is doing an illegal construction on this property.