My grandfather passed away in 2009 without making any will for his self-earned agricultural land of 24 acres. My grandmother passed away four years prior to his death. He is survived by two sons - my father and my uncle. We sold 14 acres of the property to a third party. Now, to the remaining 10 acres, my father and his brother are equally rightful. My uncle relinquished his right on 5 acres by executing a registered release deed in my father's favor (by taking some amount in return, as mentioned on the document). He did this to save on stamp duty and registration costs. However, as it is not a sale registration, uncle's daughter, who is a major and unmarried at that time, did not sign on the document. One lawyer told us that since grandfather did not inherit the property from his parents, he can give it to anyone he chooses. As grandfather passed away without making a will, his two sons will be the only rightful heirs. And so, my uncle can transfer his share to my dad by a registered release deed without his daughter's approval. Is that true? Do we have the full rights on our 10 acres? Can we sell the property to a third party without an issue?