Haw. Fam. Ct. R. 54.2

(a) Custody and visitation. A proposed stipulation seeking to establish or amend provisions in a judgment or any order relating to custody or visitation of minor children will not be approved unless there is a showing that the proposal is in the best interests of the children. Unless waived by the court, such stipulation shall be signed by both parties.

(b) Modifying or terminating support for adult children.

(1) In an action where a party seeks to modify or terminate existing orders relating to the support, maintenance and education of minor children upon a child reaching the age of majority, service of the motion or pleading seeking such relief shall be made on the adult child in addition to the adverse party in the manner provided in these Rules.

(2) A proposed stipulation seeking to modify existing orders relating to the support, maintenance and education of minor children by reducing or terminating provisions for child support upon a child attaining the age of majority shall not be approved unless the adult child affected by the proposed change shall have approved the stipulation in addition to the parties; or an affidavit or declaration is provided by either party that the child is no longer dependent for education and the child’s whereabouts are unknown; or a hearing is held.