Thanks, Layla. Your account was banned because as soon as your brother was banned he immediately logged in on your account, which is against the rules.
Please consider changing your password so he can not do this in the future.
Also, he is able to post a plea to return if he likes. He just needs to acknowledge that he knows what he did to get banned and he will behave in the future.
As for your account, I am unbanning you now. We will look forward to seeing you back on the server.