If you can't explain something to a four or five year old, just say no. Part of being partners, and being on the same team, is that what he does you're doing too. It's not okay for a mother and child to be doing something others don't want them to do (namely, the owners or managers of a place) and for the mom to shrug wide-eyed and point to the kid and say "He did it."
photo by Sandra Dodd