My husband had an account for many years, his sister placed her name on it, and the signature card. They just kept adding names. She worked in that bank. Is there a law governing signature cards? She made life very difficult for him if he didn't go along with her.
There seem to be at least two things wrong with this scenario. First, no bank should allow a third party to simply add herself to an account either as a joint owner or as an authorized signer. The permission of the current customer(s) is required, and that is the reason that that banks obtain a completely new signature card with all signatures when there's a new individual added. A joint account is a contract, not only between the depositors and the bank, but also among the joint depositors. You don't want to let just anyone sign on your account, do you? Second, it appears that a bank employee abused her position to do something that the bank ought not to have permitted, and may have dragged the bank into allegations of theft and collusion.
If the account is still open, your husband should close it out and move it to another bank, well away from any influence his sister might have. He can then review his account records to figure out if he has lost any money as a result of his sister's abusive and dishonest actions. If there are losses, your husband should talk to an attorney for advice on how to proceed.
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