20 C.F.R. § 222.44 Other relationship determinations for lump-sum payments.
Title 20 - Employees' Benefits
Other claimants will be considered to have the relationships to the employee shown below for lump-sum payment purposes: (a) Grandchildren. A grandchild is a separate class of beneficiary to be considered for lump-sum payments and is not a child of the employee; he or she is a child of the employee's son or daughter as determined under State law. A stepgrandchild is not included in this class of beneficiary. (b) Brother or Sister. “Brother” or “Sister” means a full brother or sister or a half brother or half sister, but not a stepbrother or stepsister.
Title 20: Employees' Benefits
PART 222—FAMILY RELATIONSHIPS
Subpart E—Relationship as Parent, Grandchild, Brother or Sister
§ 222.44 Other relationship determinations for lump-sum payments.