31 C.F.R. § 353.37 Payment during lives of both coowners.
Title 31 - Money and Finance: Treasury
A savings bond registered in coownership form will be paid to either coowner upon surrender with an appropriate request, and upon payment (as determined in §353.43), the other coowner will cease to have any interest in the bond. If both coowners request payment, payment will be made by check drawn in the form, “John A. Jones AND Mary C. Jones”.
Title 31: Money and Finance: Treasury
PART 353—REGULATIONS GOVERNING UNITED STATES SAVINGS BONDS, SERIES EE AND HH
Subpart H—General Provisions for Payment
§ 353.37 Payment during lives of both coowners.