Please help, my brother is almost killing me

[Mao]

I know it's bothering you very much, but usually, things like this means that there is something troubling your brother. You can have a talk with him about school, or maybe his friends. He was asking for you to accompany him to the supermarket, so he probably is feeling very lonely and needs his brother. Of course if it goes on like this, you're going to have to tell your parents about it, then the police if they don't listen/believe.