Wow that is way too young! Can a neighbor watch him for an hour? I have a very responsible 9 year old and have only left her a few times to go get something at the store. Usually it's something urgent like she's sick and I need to get her some medicine and Popsicles and don't want to drag her along with a fever/vomiting. Under normal circumstances I won't leave my kids alone yet. There are always unforeseen things that can happen even if the kid is doing everything right. The times I have left my 9yo she has to stay in my room, never answer the door or phone, and I had her on the cell most of the time I was away.