Here's where I'm struggling . . . and maybe I'm being too technical.
As cited above, a customer is one who opens an account for one who lacks capacity.
The SSA; however, expressly states that a Rep Payee may not sign legal documents (
https://www.ssa.gov/payee/faqrep.htm see "What are some examples of what a payee can not do") A signature card is a legal document so the beneficiary is the one opening the account, not the Rep Payee.
I've always taken that to mean the beneficiary is our sole client, the Rep Payee is akin to an authorized signer.
Am I splitting hairs too thin?