[Ten.Foot.Line]

My bother was teased when we were younger. Even though he is my older brother, I know how you feel. My mother also went through the same thing. But when she caught the kids beating up her older brother, she sent them to the hospital. I would not suggest doing that. But a little scaring helps sometimes.
I showed my brother that he had my full support. If anyone, even my friends, made fun of him, I told them to can it.
The school principal really didn't care, even though we came to him multiple times. I like BDF's idea about getting authorities involved. It tends to make the higher ups a little more coperative.