The neighbor is using the property behind my house as his personal driveway and a drive for his lawnmower customers. The property is not owned by him or us, but my family and I have had the neighbor and the customers to threaten to run over us when we mow our edge of our backyard. The neighbor that owns the land is living in a nursing home in another state. The children of the landowner have told us to put up a No Trespassing sign. My husband feels that we cannot do that. I am afraid I am going to be hit or threatened with bodily harm again. What can I do legally?