Siblings Who Want to Borrow Things

So my brother comes into my room and asks to borrow my DVD player. But he doesn’t even ask if he can come in my room. But the really dumb thing is there’s a DVD player in the living room too. But no, he can’t use that one because he wants to watch a movie in his room. So what does he do? He goes and tells my mom and she makes me give it to him… WHILE I’M USING IT!