I have had the same and I cut ties with the kids. My kids would not be allowed over to their house in or out and those kids were not allowed anywhere on my property. If they ran over to play when we were out front I said go home please you can not play here anymore. I even had to one time put my hands gently on the child to gesture her to leave. Another time she wouldn't leave so I brought my kids over to her house rang bell and told mom to please come remove your child from my yard as she isn't allowed there. Other times we would go inside till she got the hint and went home. It'll take a while doing these things at first but after a mth she got the hint and does not attempt to come over anymore. Good luck!