Is inherited property ancestral and do my sisters have rights?

My great-grandmother bought a house in her name. She had 3 sons, all married. Two of her sons were childless, and the third (my grandfather) had one son (my father) and two daughters. All three sons and their wives have passed away. After my great-grandmother's death, the property was never transferred. Last year, my father and his sisters executed a partition deed for the property. In this deed, my father's sisters transferred their share of the property to him in exchange for a specific amount of money. My father then executed a gift deed for the same property in my name. Is the property my father inherited from his father considered ancestral property since it came from my great-grandmother? Do my sisters have any rights to this property even after the registered gift deed was executed by my father? Please help.