- Solely for the purpose of all other state and federal statutes and any applicable policies of insurance that require a designation or determination of custody, a parenting plan must designate the parent with whom the child is scheduled to reside a majority of the time as the primary residential parent of the child; provided, that this designation shall not affect either parent’s rights and responsibilities under the parenting plan. In the absence of such a designation, the parent with whom the child is scheduled to reside a majority of the time is deemed to be the primary residential parent for the purposes of such federal and state statutes.
 - Notwithstanding any law to the contrary, when the child is scheduled to reside an equal amount of time with both parents, the parents may agree to a designation as joint primary residential parents or to waive the designation of a primary residential parent. In the absence of an agreement between the parties, a single primary residential parent must be designated; provided, that this designation shall not affect either parent’s rights and responsibilities under the parenting plan.