Any sums in a joint account may be paid, on request, to any party without regard to whether any other party is incapacitated or deceased at the time the payment is demanded. Payment may not be made to the personal representative or heirs of a deceased party under the Virginia Small Estate Act (§ 64.2-600 et seq.) unless (i) proof of death is presented to the financial institution showing that the decedent was the last surviving party or (ii) there is no right of survivorship under § 6.2-608.