Haw. Rev. Stat. § 560:5-105: Delegation of power by parent or guardian.

A parent or guardian of a minor or incapacitated person, by a power of attorney, may delegate to another person for a period not exceeding one year, which time limit shall be expressly stated in the document, any power regarding the care, custody, or property of the minor or ward, except the power to consent to marriage or adoption.