Why everyone should have a 6yo boy around.

My wife and I watched a friends of hers 2 kids for a couple hours this weekend, the girl is 11 and her brother is 6. We were playing a board game when the little boy blurted out my sister is wearing a bra she has boobies. Before we could say anything he went on she doesnt have big boobies like mommy. So my wife had an interesting story to tell his mother and she just shook her head.