216.54—Who is an employee's wife or husband.
An employee's wife or husband is an individual who—
(b)
Has been married to the employee for at least one year immediately before the date the spouse applied for annuity;
(d)
Was entitled to an annuity as a widow(er), a parent, or a disabled child under this part in the month before he or she married the employee; or
(e)
Could have been entitled to a benefit listed in paragraph (d) of this section, if the spouse had applied and been old enough in the month before he or she married the employee.