Leaving home

Recently my nephew (aged 9) got so mad about having to do guitar practice that he packed a bag and stormed up to the front door announcing his intention to leave. He didn't in the end. He packed his bear-suit onsie and his wrestling figures. His dad gave him a toothbrush and some toothpaste to put in. And then his mum cried and said she would miss him if he went. So he stayed. I'm interested in what the important items to take are, in a 9 year old's mind. I dont remember wanting to leave at that age either. My sister recounting the story made me laugh actually. And that made her laugh also. Perhaps i should provide him with a tag with my address and phone number on it so if he really decides to do it he can come to me which would at least be safer.