Can grandson claim rights in grandfather's property?

Grandpa has 4 daughters n one son.I am the grandson(Son's son) My grandfather has an house and agricultural land which he may intend to transfer to his daughter. My grandfather has already given some land to his daughter without my dad's n my consent. Can my grandfather transfer his property to his daughter without my father or my consent? This is self earned property of my grandfather.

24 years back my father bought agricultural land in Karnataka it was registered through sale deed but my father didn't do mutation.couple of years back my father and seller both passed away. Seller's son managed to change ownership claiming inheritance of the property after his father's demise, he did this without revealing that property was sold. We appealed against this decision in Asst commissioner's office & got orders favoring our position. also we got land mutated in our father's name. now we came to know that seller's grandson is preparing for a suit claiming that property was sold without his consent. grandson was a toddler at that time and his father has signed the document as a witness. i know if it is self acquired property, then grandson's claims are invalid but if it is ancestral property, do these claims valid? does our registered sale deed becomes invalid? they are purposefully trying to harass us for a mistake of not doing mutation, do we have any recourse. thanku

My maternal grand father had 2 sons and 1 daughter. He died in 1972. ( Intestate with out will).My mother was one of the daughter, she was born in 1945 and died in 1987. The Hindu succession Act 1956 but my mother was born before 1956 Act How can I eligible for my maternal grandfather property.