That's uh, creepy. I would seriously think about calling police and reporting suspicious activity. Reasons are that a lot of houses like that generally are drug dealing houses. And besides, it's just a precaution and can't hurt anyone. Basically I put it like this, if they move, and some family moves into therr with a kid, the chemicals from drugs can cause serious and deforming cancer. Do it for the kids. And that's not sarcasm or a joke man.