My boys are very lucky to have their own personal Taekwondo instructor. Three times a week they have a little class in our downstairs. Saturday is sparring day.
IJ may have a soft spot in his heart for his baby sister, but he has an aggressive fighting streak for his brother. After kicking his brother too hard for class sparring, M split the boys up and sparred them individually. Part of IJ's education is learning that kicking hard doesn't necessarily earn points.

Hitting the target with precision and control is far more important than pure power. Especially when one is sparring someone younger and smaller. IJ got a taste of his own medicine (and learned a new way to duck) while sparring his dad. Don't worry, M didn't unleash his third degree black belt powers on a seven year old red belt.
Here S tries to get his dad with a sliding roundhouse: