Rule 31 of Non-Contentious Probate Rules state that :
Where a person to whom a grant would otherwise be made is under the age of 21 years, administration for his use and benefit until he attains that age shall be granted :
(a)    to the parents of the person jointly or to any guardian appointed by the court; or
(b)   if there is no such guardian able and willing to act and the person has attained the age of 16 years, to any next of kin nominated by the person or, where the person is a married woman, to any such next of kin or to her husband if nominated by her.
Also, administration for the use and benefit of the person under the age of 21 years until he attains that age may be granted to any person assigned as guardian by order of the Registrar in default of, or jointly with, or to the exclusion of, any such person as is mentioned in above paragraph; and such an order may be made on application by the intended guardian, who shall file an affidavit in support of the application and, if required by the Registrar, an affidavit of fitness sworn by a responsible person.
Where a person under the age of 21 years who is sole executor has no interest in the residuary estate of the deceased, administration for the use and benefit of the person until he attains the age of 21 years shall, unless the Registrar otherwise directs, be granted to the person entitled to the residuary estate.
Where by virtue of section 25 of the Probate And Administration Ordinance, a grant is required to be made to not less than 2 administrators and there is only one person competent and willing to take a grant under the foregoing provisions of this rule, administration may, unless the Registrar otherwise directs, be granted to such person jointly with any other person nominated by him as a fit and proper person to take the grant.