Property dispute

Dear Sir My mother has an inherited property in a village in Hamirpur (himachal pradesh) from my grand father. My father passed away in 1996. after my father's death my Taya Ji (my father's brother) on behalf of my grand father's (who was passed away earlier and given rights of his all property to his eldest son-my Taya Ji) distributed ancestor's property to all of his brothers or widow of his brothers. This has happend 25 years back. We have all papers of distribution. After getting our share (though it was not equally given to my mother because of no support) she had constructed a small house for living on a part of land by taking some loan from bank 25 years back and also at back portion she used the land for agricultural purpose. Now my cousin (Taya Ji's Son) making dispute and threatning my mom. That he will take this property back and he also fight again and again with my mom. My mom is in village and she lives alone in that house. She does not want me to interfere as she is also afraid that my cousin is kind of bad person (some kind of village gunda). He can harm anybody. She complaint to police station but they refused saying its a property matter we cant do. She approached tehsildar but he also gave some excuses. Need to know how can I proceed for legal action against my cousin. My mom leaves alone and her life is also in danger because of my cousin. She does not want to leave her old house and come to me. Please suggest.