Okay, so, I like to track my kids height by measuring them on a wall. Now, my side of the family has always been really tall, (I'm 6'5), and my husband and I figured that our kids would grow quickly like us. While my daughter has been growing a lot, she's 6'2, my son hasn't grown since he was 11. He's 4'11, and extremely sensitive about his height. His sister figured this out pretty quickly, and she's been teasing him about it. Last night, she took his phone and put it on top of the fridge, where he can't reach. This lead to a fight, and I had to separate them.

How do I get this to stop? My son has a bruise on his arm, and my daughter is currently grounded.