Code of Federal Regulations Title 20. Employees' Benefits § 20.404.361 When a natural child is dependent

(i) When you applied;

(ii) When the insured died;  or

(iii) If the insured had a period of disability that lasted until he or she became entitled to disability or old-age benefits or died, at the beginning of the period of disability or at the time he or she became entitled to disability or old-age benefits.

(i) You were adopted by someone other than the insured after you applied for child's benefits;  or

(ii) The insured had a period of disability that lasted until he or she became entitled to old-age or disability benefits or died, and you are adopted by someone other than the insured after the beginning of that period of disability.