what should I do

I have a little brother. He is very naughty and often harms others. For example, throwing all the fish from the ground on the ground and disposing of the flowers and trees in the community. He took the flowers and pulled them out. I portrayed the lettering on the tree. One more time, I was writing homework. Suddenly the phone rang. I picked up the phone. When I came back, my homework was filled with pen water, but he was laughing.

What should I do with the teacher?