Account sharing is against the rules. This is one of the reasons why. Any complaints to be able to lock a character or something like that will be answered with "Account sharing is against the rules, therefore there should be no need to do that."
So either discipline your brother yourself or get him to buy his own copy after you change the password. And if your parents (or other authority figure) tell you to let him back on, simply point out that you just realized account sharing is prohibited. There is no other way to lock a character.
Now, I'm not exactly sure where this is said, but I think it's either in the EULA or the website. It's one of the two. If I have any free time I'll look for it, but it's too late tonight.
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