My next door neighbours are a normal, nice, professional couple. However, their house is a tip - almost like one of those from Channel 4 like 'hoarders next door' or that Kim and Aggie visit, but not quite at that level IYSWIM. My DS plays well with their DS, I try and encourage the play to be in our house or outside (if it is nice) but it is hard to avoid him being in their house from time to time. Would you find this ok? Would you worry? Or should I just ignore.