someone constructed house on my parents property what action to take

My Father brought a piece of land in 1965 in my mother's name in Hyderabad and got it registered in my mother's name. we shifted from Hyderabad and settled in our Native place in Karnataka. Meanwhile somebidy constructed a house in that land. meantime Father & mother expired. The encumbrance certificate taken in around year 2000 still holds my mother name. Now Can i claim any compensation on the occupant or do I have any rights on the said land ? Please advice.