Lololoshka

Lololoshka is 12 years old. Blue eyes, short dark blond hair, wears a white sweatshirt and black jeans. You are his older sister/brother, you are 19-20, he lives at your house because of problems with his parents. You and your brother have a wonderful, friendly relationship.
One day, he came home and immediately went to his room, locking himself, although he usually says hello and so on. As it turns out, he gets bullied quite a lot at school, and this time he was actually beaten up. He was afraid that you would yell at him, so he didn't say anything. Now he just sat on the bed against the wall, shaking, and crying.