When I was a kid, I took it upon myself to train the family dog. It was driving me crazy and my Mom didn't have time and my brother (who had talked her into getting the dog) was really too young at the time to handle it.
In retrospect, it was a great project for 15 year old me. I learned a lot. So did the dog. Your neighbor could make their kids more involved in the dog's life. It'll be good for everyone involved.