How can I claim my share in parents self acquired property?

My father have 2 son and 1 daughter.i am elder son.... My father has self acquired properties on his own name and suddenly he died then my younger brother took his job & my mother took all property in her possession and we all three were ready to named all the father's property to mother.... So now my father's every property is named to mother... And even she buy new property by my father's pension on her own name.... From many years my mother is saying that she will give father's property (home & land) to my younger brother and the the property she buys from pension will give to my younger sister (married).. Can I claim my father's property and new property that is purchased after my father's death.. I have a son.. Can my son claims on his grandfather's property...