Like Dutch said, I agree and think it would be best to have separate accounts. At least I think that way, because I cannot trust my brother, hehe. Anyway, if you can trust your brother in that he won't break the rules and get both of you banned or delete your characters, then go right ahead.
I've actually shared an account with my best friend (that I knew IRL) and we occasionally troll each other, like adding characters named "mufasa m" who have colors that are like dark yellow and olive green or moving their character to a different world. But we would never try to get eachother banned; I trust her with my life.
My point is that you should make sure you can trust him!
