Police protection for construction of House

We have been building a house for my parents to shift after my father's retirement in his home town. He bought the house along with his cousin sister. And divided the land between him and her. His cousin sister started the house construction and once she completed the house she started filing false cases against my father. From past 5 years we have been going to court and solving the case one by one. Recently 5 months back we received the approval for construction of the house from court and panchayat. But the cousin sister (who is the neighbour) is not allowing the workers to work. We approached the police with all the proof that we can build the house. The police also agreed to the same after reviewing the entire file. But police is not able to act as the land is under civil case. They are requesting us to file for police protection and then they can come help us. Since the court is not having hearing from past 4 months (judge got transferred). We are not able to file for a police protection. My question to you is how can we apply for a police protection? Can we apply it through collector? Is there any other method to do it?