when I was a kid we had guns all over the house. I knew where every one of them was. They were all loaded. My parents had 4 kids, with loaded guns in the house at all times, none of them locked up. None of the kids ever played with the guns, or shot any friends/family or themselves.
I think I was 5 when my dad showed me where one .22 revolver was. Said if anyone ever got in our house (who wasn't supposed to be there) while I was home to get that gun and shoot them. He showed me how to use it, but I never shot a pistol until I was about 8 or 9 (at a target, not a person).
If that were to happen today and anyone reported it, I bet kids could be taken by CPS.