Agent of next of kin
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
When a deceased employee or retiree has not named a beneficiary and one of the next of kin entitled makes a claim for the accrued benefit, other next of kin entitled to share in the unexpended balance or accrued benefit may designate the one who made the claim to act as their agent to receive their distributive shares.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.