A lot of banks have adopted CIP requirements that go well beyond the minimum requirements of the regulation. They call for applying identification and verification standards to all authorized signers, as well as individuals such as the vulnerable adult or minor in your examples, when the regulation would not impose such requirements. I suppose it may be easier to train staff members to always obtain and verify ID on every individual associated with an account, but such expansive policy requirements often get banks into the swamp when they run into objections from authorized signers on non-profit organization accounts or accounts of major national businesses, or, at a community level, when beneficial ownership is held by a non-owner of the account (a minor under a UTMA account or a ward under a guardianship).
More reasonable (my opinion) CIPs call for limited information about beneficial owners -- SSN and DOB for a minor, for example, or SSN for a ward -- that is needed to administer the account, but stop short of calling for ID. And when it comes to authorized signers, many banks don't bother with CIP at all unless the individuals are key owners of a business.
So I can't say what is "customary" among banks in your area, but I have suggested what some of the options might be.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8