Kids Playing in the Neighborhood?

Today's question says, "We have neighbors who ask to play with our children nearly every day. I do not allow my children to play with them unsupervised. There has been too much crude talk, unbiblical ideas and violent play when neighborhood children are left to play unsupervised. We do desire to minister to the children in our neighborhood, but it seems to be derogatory or stressful on our own children for that to be allowed. I would love thoughts on how to navigate this situation."