Can I get my share of property

Hi, My name is pavan. Im from Mysore. I'm 23years old. My grand parents have 3 children's (1st my father, then two daughters) 1 daughter lives in USA with her husband and 1 daughter. Second one is currently staying with us from last year after she lost her husband. she has a daughter who's working in Bangalore. The thing is that I lost my father 3 years back. he died of cardiac arrest. And now I'm the only grandson to my grandparents (other 2 are granddaughter). Now my grandparents and his two daughters (My Aunty's) are treating me and my mom very cheaply because she has no husband and they say u don't have any right on the property we are staying from 25years (own house). And the worst thing is that mom don't have parents to stay..where she can go..now all are trying to send us both out of the house without anything..my mom is a housewife and I'm studying still.. now me and my mom can't stay with these people. They are not dividing the property also.. what should I do legally to get my share of property and live peacefully with my mom somewhere else.. please help me.. thanks