should i dropkick my kid brother for going into the garage?

I don't have any siblings, but when I was a kid, we had some friends living with us for a month or so while they had a house built. While I was at school, the little red-headed ****** they called son used my model paint and painted all my OLD Matchbox cars and trucks that I had inherited from my dad. To say I was pissed was an understatement. They didn't even scold the boy.