Mine are all over the place. Got some in my Dad's gun safe,some boxed up,and the rest in kitchen cabinets and drawers(dishes,cookware,wot's that?). Any I don't have boxes for go in Sack Ups rolls. They're made of silicon-impregnated cotton to protect from rust(you might want to look into them to solve your prob).
As for the kid,education is the best answer. I grew up w/guns all over the house,but there were never any probs because I was taught proper gun handling and safety at an early age.