Awesome article! My wife likes to associate any aggressive action by my 5 year old boy as a reason he should not be exposed to jiujitsu. Sharing articles like these really helps me articulate my point on why I think it's not only OK but it is a positive thing to include him in this very important part of my life & why I like to bring him to the gym for open mat to play-grapple. He certainly doesn't see anyone getting angry & doesn't learn anything resembling a submission but I feel like he's gaining a love of the game just by grappling with Dad (his favorite game). He's also developing his base (which is AWESOME).