Every so often, my neighbor feels that he can come onto my property (usually when I'm sleeping or not at home). He takes my umbrella, uses my trash can, crosses my porch to go onto another neighbor’s porch, dumps their snow on my side of the property, runs over my trash can with their car, etc.
Most recently, he has built a fence. The opening part of their fence comes onto my property. They also have stepping stones on my property leading to the opening of their fence.
This morning, when I woke up, I went to my back room and heard a drilling noise that sounded really close. When I looked out of my back window, I saw my neighbor’s brother in my backyard drilling something on their fence.
My neighbors know how I feel about them coming onto my property, yet they won't stop. What can I do?