You want to kill a blk child (might be 18+) over 15Cents (Hope it is not a RAP CD)? That is a hate crime. I think you are very unstable. You need professional help. (If I am right, you have problem with BLK people historically.)
For your kids, he did the right thing and have authority to deal with the problem. So he does not have to go with you. I think instead of the piano class, he needs some kinda Karate training. He might need a CCW down the road, depend on where you live.
For the blk kids, that might not be his first rodeo. If he is 18+, then he will disappear for a good time. Of course his brother from another mother will take care of your kids for him.
Seriously, I laugh my tear off when I read your post.