How to inherit grandfathers property ?

MY NAME IS (HINDHU) AGED 24 YEARS. MY FATHER EXPIRED IN 2001. MY GRAND PARENTS HAVE 2 SONS(INCLUDING MY FATHER) AND 1 DAUGHTER. MY GRAND PARENTS ARE ALIVE NOW.THEY ARE DENYING TO SHARE THE PROPERTY TO US.THEY HAVE TOTAL 3 PROPERTIES IN THEIR NAMES. 1 IN MY G.FATHER'S NAME AND 2 IN MY G.MOTHERS NAME. THEY GIFTED ABOVE PROPERTIES TO MY FATHERS BROTHER AND MY FATHERS SISTER I.E.,TO THEIR CHILDREN WHO IS ALIVE. ACTUALLY MY FATHER CONTRIBUTED HIS INCOME IN AQUIRING THAT PROPERTIES BY DOING BUSINESS BUT THOSE HAVE NO EVIDENCE. ALSO WE DONT HAVE ANY OTHER EVIDENCE TO PROVE. THEY ARE CLAIMING IT AS SELF AQUIRED PROPERTY. CAN I OR MY MOTHER CLAIM SHARE IN THOSE PROPERTIES? THANKS IN ADVANCE FOR YOUR TIME IN REPLYING US.