<human>: Can you summarize the given text in a few sentences?

For the past few years there has been a feud between my parents neighbors across the street, my step dad's brother who lives up the street, and another neighbor next door to my parents, and my step dad. The across the street neighbor (we will call Kevin), step dad's brother (Buzz) and the other neighbor (we will call Lester.) All parties are 50+
Buzz caught K's wife stealing out of my mom's garden, started the fight. Lester hangs out with all three people and makes shit up and starts fights among all of them.
K has been known to call the cops on Step dad for nothing (things like getting grass clippings in his driveway and flipping him the bird.) 
K has shot things in my parents carport with his bb gun, and supposedly poisons neighborhood animals. Most recently he has dumped my parents trash can out in the driveway. Once yesterday while it was out for pick up, then today since it couldn't get picked up while it was all over the driveway. They put the full trash by the carport and came home to it pulled to the road and dumped out again. 
This is assumed that it is him, no one saw him do it, but he is the only person in the neighborhood that has a problem with my parents. 
What would be the best course of action?
<bot>: Parent's neighbor is constantly harassing them and vandalizing their property. There is no definite evidence of who is doing it, but they know the guy that is. What should we do?