I have 2 boys, ages 5 and 8. Both know I carry, and a time or two have said or asked things in public places that I would have rather them not said. Luckily, nobody was paying any attention. I have since told them in various ways that it is not for discussion in public. They have mostly became used to it and rarely bring it up anymore. I also used the advised responsible tactics of removing all the curiousity out of me carrying a firearm or them seeing me carrying on occasion. I'm sure you and your wife are familiar with these tactics, they seemed to have worked for me and my sons. Good luck.
“The fundamental force behind the Second Amendment is to empower the people and give them the greatest measure of authority over the tyranny of runaway government.” U.S. Rep. Bob Schaffer, 2002