My kids are now grown, but not long out of the house. Most of my guns are in a safe, but there have always been several loaded handguns in my house, even with infant kids. Night stand is one obvious place, and high on a closet shelf another.
From the earliest age, they were given instruction, and allowed to handle, ask, or just see any of the guns, as long as Mom or I were present. Disciple was swift and certain, but never had to be implemented with the guns. They knew if they broke the simple rule, they wouldn't get to handle or see ANY guns for the longest period of time. And besides, when they can handle, fondle, and feel any gun they wanted just by asking, the mystery and temptation went away.
This is a mode of parenting that won't work for everyone. My sister wouldn't dream of this approach, and even my parents were skeptical. All I can say is it worked for me. Perhaps too well, as my grown kids show little interest in firearms besides hunting. They have taken countless guns to the range over the years, and now that they are starting out on their own lives guns are not their highest priority. Somewhat disappointing for a true gun nut like me, but I know they can make their own decisions with firearms responsibly for the rest of their lives.
Bill