Code of Federal Regulations Title 20. Employees' Benefits § 20.216.66 Who is an employee's surviving divorced spouse

(1) Is the natural parent of the employee's child;

(2) Was married to the employee at the time the employee or the surviving divorced spouse adopted the other's child who was then under 18 years old;  or

(3) Was married to the employee at the time they adopted a child who was then under 18 years old.