How can I get my share in my grandmother's property

my name is reddy.i am a physically handicapped person with age of 28 years.i am unmarried.my mother got marriage on 1987.we are hindu .my mother and i faced several problems from my father,grandmother,uncle,aunt etc.my mother put a dvc case,498a case on my father.my grandmother,father,etc has planned to sell our 2 floor house to some body.but we did not agree.money lender has put a case on my grandmother of amount 30 lakh .money lender having a promissary note and house documents.money lender,grandmother,father etc are against my mother.what are the rights we have to get share on that house.