the scene: dad at a meeting, mom needs to bathe the kids. she thinks, "the easiest and fastest way to do this is to bathe one kid while the other one sits on the floor and waits. then they trade."
mom has to walk out of the room for a second, and she overhears this from her almost-5-year-old son to her 6-year-old daughter:
"gillian, my penis is wiggling. my first penis tooth is about to fall out."
this confirms two things to the mom: 1. her son has a deranged mind. 2. never, ever let either child be naked when the other one is around.