(a) A dependent child who is not in the care of the surviving spouse shall be included in the calculation of the children’s portion of the survivor benefit allowance. That child’s portion of the allowance shall be paid to the guardian of the estate of the child, the natural or adoptive parent having custody of the child, or if none, then to the trustee of the trust established for the benefit of the child.
(b) In the case of a dependent child who is age 18 years or older, the child’s portion of the allowance shall be paid to the guardian of the estate of the child, trustee of the trust established for the benefit of the child, or if none, then to the child.