My parents have noisy neighbor because of whom they are unable to sleep at nights

We have bought our property about 12 years ago and had been living there for over 18 years. There is this neighbor who has been a trouble maker ever since we have brought this property. He makes noises at night by using the hand pump available in his property sometimes during mid night after 12 am. If not that he makes noises by thumping on some objects so loudly that even people who are already asleep wakes up scared. We used to live in a single ground floor earlier. To avoid him we had to construct a single first floor and moved there. We gave the ground floor to some tenants. He used to drive away the tenants living there with these noises or by talking to them individually saying that our house is haunted, has no vastu at all and other stuff like that. Lucky us that our current tenants were hell bound and did not listen to what he had to say. Now at nights he makes these loud noises like wall hammering or drilling. This is not continuous but happens quiet often. And in the mornings he would use his sound decks so loudly that even after closing all the doors we wont be able to watch tvs or able to hear what the other person is talking within our homes. My mom put on complaints with the police a number of times. Since what ever he does happens in his property police would tell him to lower the sounds and leave. We also believe that he is offering bribes to these people. He talks all shit loudly at his home. All day he walks over his open space with only a towel hanging on his belly almost displaying most of his private parts. His house has a lot of open space which mostly opens in gaze of a lot of houses. There are a lot of young girls and women near by. Except us no one is ready to take the stand because of the fear involved in complaining although they also feel the pain. Since it is only us complaining all the time, no serious action is taken against him as of this date and he is still able to do what ever he wishes. I am married now and don't live with my parents. But every day I am concerned about my parents due to this idiot. I wanted to move them for a while to another house, but my folks are too old. There are a lot of relatives living by. My dad has been a heart patient and if there is any medical emergency, I can rely on these relatives. I cannot move them from the house that they dearly purchased.