My mother's grandfather properties

Dear Sir, Madam's I am kishore from hyd , Andhra Pradesh .My grand father has expired in the year 2013. He has 1 son and 1 daughter. When concerned with settlement of properties, my uncle is not willing to give us any property . In actual this Property belongs to my mother's grand father which my uncle and my grandfather has shown in land ceiling act in 1976 . My grandfather had will in 1999 to his son.Hence I wanted to know whether my mother has any rights to acquire the property as i didnt get any clarifications from my lawyers