Am I crazy?

My brother constantly shoves me and grabs me all of the time. He acts as if he is my boss and if I don’t do what he tells me to do, he yells at me, call me names that I can’t even say out loud let alone call someone, etc. My mom never does a thing about this and never has. In fact sometimes she joins in. I’ve been called the worst names since 7/8. Is this normal??