I took my 12 YO son and 3 1/2 YO grandson to Chick-Fil-A last week. While we're waiting in the drive-thru lane, my son asks me (out of the blue), "what does 'lustful' mean?" I tried to keep it simple, i.e. it's ok to look/glance at women, just don't stare.
Two seconds later, my grandson shouts out, "Oh, I get it now!"
I’m the one in the family who is most likely to say rude and inappropriate things. Years ago I was driving my young boys to a game, and we saw an extremely obese woman sitting on a bench at a bus stop. My kids looked at me but they were afraid to laugh or say anything. I told them it was a good thing she was sitting in the middle, because if she sat at the end she would tip the bench over. They still remember that!