When I was on active duty infantry officer from 1980-1984 my outfit used to hold a "Family Day" with a huge BBQ and sodas and tea and we held it on a Saturday on a military firing range. It was an opportunity for the family to bring out the family firearms for a safety and shooting session. All the wives and kids older than say ten who had already gotten trained in safety got a review and went with a set of range safety officers to another range next door where they were able to fire a variety of firearms. The family weapons, to be sure but also a sample of small and larger civilian weapons and there were demonstrations of the standard infantry small arms.
But the real story was with the really little kids. You've got to understand that kids are usually VISUAL learners. You can talk to them all day and they won't internalize a bit of that data. But when they SEE and FEEL the lesson, it's a different matter. Each kid as young as age FIVE was given a HONEYDEW MELON and a marker with instructions to draw a detailed face on the melon. Eyes, ears, hair, nose, mouth, you name it. Once that was done, the children were told to imagine as hard as they could this was their BEST friend.
One by one the safety officers brought the kids to the firing line with their service member father. The melon would be placed downrange at a distance of about 21 feet. The child would walk to the line escorted by safety officers and be met by "Dad" with the weapon (usually a 1911 45 acp). The child would be wearing eye and ear protection. Dad would kneel and tell the child: THIS is what happens when you touch daddy's guns without him being present!
Then the child is allowed to gently put his hand on the forearm of dad's firing hand. This is so there is a tactile recognition of the recoil and the noise. This makes it REAL over tv or the movies. Even with the hearing protection, the kid jumps when the piece goes off but you should see their eyes as they watch that melon EXPLODE. Kids are not stupid. They ALL "got it." Forever more you could put a gun down in front of little Johnny on the kitchen table and watch that kid back up ten feet, with fierce verbal denial: NO DAD! NO! BANG BANG! The following year, young ones were either reinforcing the safety or when they got to ten they got to learn basic rifle marksmanship.