5 Del. C. § 1919: Investments standing in the names of 2 or more persons.

When an investment in the shares of any building and loan association is made in the name of 2 or more persons, deliverable or payable to either, or to the survivor or survivors, the investment, or any part thereof, or the increase thereof, may be delivered or paid to either of the persons, or to the survivor or survivors, in due course of business.