D.C. Mun. Regs. tit. 30, r. 30-601
A claim form shall be filed in the name of a single legal entity as claimant, either one individual or one organization. Multiple payees shall not be permitted.
A claim may be entered in the name of an organization only if the organization possesses a Federal Employer Identification Number (FEIN) issued by the Internal Revenue Service and the number is shown on the claim form. Groups, family units, clubs, or organizations without a FEIN shall designate in writing one (1) individual to receive the prize.
If the back of a ticket contains multiple signatures, or if a claim is erroneously entered with multiple claimants, the signators or claimants shall designate one (1) of them as recipient of the prize, if any. If they fail to designate an individual recipient, the Executive Director may designate any one of the signators or claimants as the sole recipient of the prize or may reject the claim.
Payment of the prize to the sole recipient designated pursuant to § 601.3 shall effect the full and complete discharge of liability to pay the prize provided by § 611.
Nothing in this Title shall be deemed to permit multiple payees on a single POWERBALL(R) ticket.
D.C. Mun. Regs. tit. 30, r. 30-601