Need Help Managing Bank For Two People

I just recently introduced my sibling to wynncraft after discovering it myself and I only had one character. We share one Minecraft account. Then when my sibling used the bank I discovered it was shared across all characters. Is there any way of getting around this? Not only can he take my stuff, even if we did share it, all the bank pages I paid for they're using for free, and I also lose out on half my bank space.

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Any suggestions besides buying another Minecraft account?

 

Unfortunately there's not really an option, as the game is meant to be played with just 1 person per account. Basically the only thing you can do is buy more bank pages, and split the bank I guess.