20 C.F.R. § 218.42 When a parent annuity ends.
Title 20 - Employees' Benefits
(a) Tier I. The tier I benefit of a parent annuity ends with the earliest of the last day of the month before the month in which the parent— (1) Dies; (2) Becomes entitled to an old age benefit under the Social Security Act that is equal to or larger than the tier I benefit of the parent annuity before any reduction for the family maximum, unless he or she is also entitled to a tier II benefit (reduction for the family maximum is discussed in part 228 of this chapter); (3) Becomes entitled to another survivor annuity in a larger amount, unless he or she elects to be paid the smaller annuity; or (4) Remarries after the employee's death, unless he or she marries a person who is entitled to Social Security or Railroad Retirement Act benefits as a divorced spouse, widow, widower, mother, father, parent, or disabled child. (b) Tier II. The tier II benefit of a parent annuity ends with the earliest of the last day of the month before the month in which the parent— (1) Dies; (2) Remarries after the employee's death; or (3) Becomes entitled to another survivor annuity in a larger amount, unless he or she elects to be paid the smaller annuity.
Title 20: Employees' Benefits
PART 218—ANNUITY BEGINNING AND ENDING DATES
Subpart D—When an Annuity Ends
§ 218.42 When a parent annuity ends.

