5 C.F.R. § 843.402
Eligibility requirements.
A surviving child of an employee or retiree who dies after completing 18 months of civilian service creditable under FERS is entitled to an annuity under this subpart.
A surviving child of an employee or retiree who dies after completing 18 months of civilian service creditable under FERS is entitled to an annuity under this subpart.