An individual who was married to the employee at the employee's death is the deceased employee's widow(er) if he or she:

(a) Was married to the employee for at least 9 months before the day the employee died;

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

(c) Was married to the employee when either the employee or the widow(er) adopted the other's child, or they both legally adopted a child who was then under 18 years old;

(d) Was married to the employee less than 9 months before the employee died but, at the time of marriage, the employee was reasonably expected to live for 9 months; and

(1) The employee's death was accidental;

(2) The employee died in the line of duty while he or she was serving active duty as a member of armed forces of the United States; or

(3) The surviving spouse was previously married to the employee for at least 9 months;

(e) Was entitled in the month before the month of marriage to either:

(1) A benefit under section 202 of the Social Security Act as a widow, widower, spouse (divorced spouse, surviving divorced spouse), father, mother, parent, or disabled child; or

(2) An annuity under the Railroad Retirement Act as a widow, widower, divorced spouse, or surviving divorced spouse, parent or disabled child; or

(f) Could have been entitled to a benefit listed in paragraph (e) of this section, if the widow(er) had applied and been old enough to qualify therefor in the month before the month of marriage.