It is not permissible for the guardian to dispose of wealth belonging to the one who is under his guardianship, except in a manner that will most likely be in the latter’s best interests

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Check below answers in case you are looking for other related questions:
Zakaah on money in the bank
If wealth dips below the nisaab during the year

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Related Answers:
No zakaah is due if one ceased to own the nisaab (minimum threshold) before the year was complete
Is zakaah due on his money in the bank to which he does not have access?
She has children who minors and they have money in the bank – does she have to pay zakaah on it?
Zakaah on money in the bank
If wealth dips below the nisaab during the year

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