What procedure and precautions should the banker takes in operating a joint account? Can the balance of joint account of husband and wife be paid to wife after the death of her husband?

Mr. Abdullah a retired govt. official, had been maintaining a savings account with ABC Bank, Gulshan Branch. He authorized his second wife Mrs. Aziza Abdullah, who had no children, as a nominee of this account and they lived together with their two children along with his 1st wife Mrs. Hanufa Abdullah. Unfortunately, Mr. Abdullah at his age of 66 died. After one month, his two children came to branch and reported about their father's death in black and white. In the next day, Mrs. Hanufa Abdullah came to bank branch with her lawyer and submit an application to Branch Manager (BM) for transferring his husband's proceeds to her personal account maintaining jointly with the deceased at the same branch. Now what will branch manager do? Explain the next course of actions.