Tenant rule breaker suggestions

[Steven Westlake]

So heres my issue today. My tenants boy friend keeps parking in the yard. And where he parks is only half in my property, half on the neighbors property. I have a parking lot big enough for 5 or 6 cars, and I’ve never seen more than 4, including mine there. Average is maybe 2, this tenant does not own a car. When i say something he moves his van, and apologizes. Then does it again later.

Hopefully somebody has an idea.