D.C. Code § 19-1103: Custodial trustee for future payment or transfer.

(a)

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(b)

Persons may be designated as substitute or successor custodial trustees to whom the property must be paid or transferred in the order named if the first designated custodial trustee is unable or unwilling to serve.

(c)

A designation under this section may be made in a will, a trust, a deed, a multiple-party account, an insurance policy, an instrument exercising a power of appointment, or a writing designating a beneficiary of contractual rights. If the designation is not made in one of the foregoing ways, the designation must be registered with or delivered to the fiduciary, payor, issuer, or obligor of the future right in order to be effective.