I am finding it very difficult to follow what you are saying, but I will have a go anyway. A joint account is just that, a shared account. The bank cannot be held liable for the source of the money which is put in to the account. Opening the account is a simple matter of proving ID and providing signatures. Putting money into it is a separate transaction, and obviously requires a transfer of funds which needs to be authorised in the same way as any other financial transaction. It would be the same as writing a cheque or a direct debit. If it is properly authorised, then the bank can hardly be held responsible for honouring it. After all that is their main purpose. I hope this is helpful, and I also hope that you, or someone close to you, has not been the victim of a scam.