They may need to set up a trust account in order to accomplish what they want. The bank should never be giving out advice on how they need to structure accounts, that function should be limited to their attorney or financial advisor.
The bank should offer a variety of accounts. Minor accounts (if allowed under State law and the bank chooses to offer them), joint accounts (with a minor, again with the same caveat), UTMA and other offical custodial arrangements (guardianships, trusts, etc).
Trying to make something up for the customer that is not supported by State law is only going to lead to problems for all parties involved - including the bank.
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