I think my brother has OCD..? PLEASE HELP. )':?

Well, several years ago..my brother was diagnosed with OCD. It's just that…I have researched the symptoms..and he has NONE. He had the complusive touching thing practically four years ago. But..that went away, and other than that..he doesn't have any of the symptoms. He's just…horrible to me and my family. And, he calls us horrbile names. He never washes himself regularly and he'll wear the same pants that havn't been washed at least three times a week. He scratches his head just to watch the dry skin come off. And, he usually stays in his room all day watching youtube videos. (Please note I am NOT trying to embarass him. I just want to inform you guys of what he does) He seems to not care about anybody other than himself…UNLESS there's an emergency…and, if there ever is something like an emergency..he worries about the COST. Right now, I am sitting in my room crying. Because..well, long story short; he got me in trouble, hit me twice, told me nobody likes me, and laughed about it. Why? Because I offered to help him pick out what to wear to church. My parents can't even control him. He gets all of the attention, and..I get barely any. And, when they try to talk to him, it usually turns into a screaming match. I feel helpless..like, there's nobody I can talk to. My parents are both mad at me, and I can't go to a friend, because they wouldn't understand. I may be wrong..but, I give up on trying to help my brother. I do NOT think he has OCD. I also may be wrong about that. Can anybody help me? And, what do you think?

Thank You.