Property issue

My father is an ex defence personal from aur-force and aged 74+ years. Our ancestoral property was divided between my father and his nephew ( since nephew's father has ecpired before partition).bigger portion is acquired by them and smaller part along with some land is with my father.....he had done new construction attached with the old one....its all story of 20 years back.......now nephew has obligation that my father has taken his portion on the old house and lodged civil case.......though all documents are in my fathers favour. .......case is in court and running. ....now my fathers is doing repairing in the new construction (not in the disputed part)as its breaking and cracking.....he us complaining to the local police.....they r bothering my father (no behavioural issue from them)....we have cleared and file report to local police and they assured that they will not entertain him ad its fake report. ....three times this happened and new police officers r coming and bothering. .....pls suggest