Section 222.31 - Relationship as child for annuity and lump-sum payment purposes(a)Annuity claimant. When there are claimants under paragraph (a)(1), (a)(2), or (a)(3) of § 222.30 , a person will be considered the child of the employee when that person is- (1) The natural or legally adopted child of the employee (see § 222.33 ); or(2) The stepchild of the employee; or(3) The grandchild or step-grandchild of the employee or spouse; or(4) The equitably adopted child of the employee.(b)Lump-sum payment claimant. A claimant for a lump-sum payment must be one of the following in order to be considered the child of the employee:(1) The natural child of the employee;(2) A child legally adopted by the employee (this does not include any child adopted by the employee's widow or widower after the employee's death); or(3) The equitably adopted child of the employee. For procedures on how a determination of the person's relationship to the employee is made, see §§ 222.32-222 .33. 65 FR 20726 , Apr. 18, 2000