I got a text today from one on the mums in my ds class asking him to their house some afternoon to play with their son. They are both just turned 5. I feel a bit nervous about this as I don't really know them at all, don't know who will be about or what they will be doing, if there will be proper supervision ect. I think he is a bit young to just be let off on his own and like most young boys of that age he hasn't much sense. I have five kids under 10, so I wouldnt think I am neurotic on child safety etc but I don't feel right about this, am I being overly precious or is this reasonable and if so how do I politely decline??