(1) After the depositor dies, in order to prove his identity and have the right to withdraw the deposit, the legal heir shall apply to the local notary office (the county or city people's court without a notary office, the same below) for the inheritance certificate, and the bank shall handle the transfer or payment procedures accordingly. If the right to deposit inheritance is disputed, the people's court shall make a judgment. The bank shall handle the transfer or payment formalities with the judgment, ruling or conciliation statement of the people's court.

Like your family (no passbook, bank card number), you need to go to the notary office for notarization. If all of them are transferred to your mother's name, other heirs need to sign to give up inheritance, and the court will issue a ruling. Then your mother took her ID card, court ruling, your father's death certificate, judicial certificate and the depositor's (your father's) ID card to the bank to apply for an inquiry. Just provide the depositor's ID number, and the depositor's deposit balance can be inquired at any outlet; The premise is that only the public security, procuratorial, legal, auditing and higher authorities have the right to inquire about bank deposits with valid certificates, so the ruling (or judgment or mediation) issued by the court is necessary.

Please consult your local bank again for details.