#1 - stop that kid's behavior now. And if he dive intp purses, nip that in the bud.
#2 - if the gun is not on you, in a holster, put it in a lock box and lock it.
#3 - I am not a big advocate of chambering/clearing a weapon often, so you might consider locking up your outdoor gun when you come home, and carrying an indoor gun with the chamber empty. You don't really want your kid, or anyone else, firing your gun.
"...our quick technology allows use to indulge our deepest stupidity and tastelessness with out first thinking...."