DIVORCED PARENTS who effectively split custody of their child — even though the divorce decree granted custody to one party — altered their status and effectively voided a court’s child support order calling for payments from the non-custodial mother to the custodial father, the Appellate Division, First Department, ruled last week.

A unanimous four-judge panel, in an opinion signed by Justice Betty Weinberg Ellerin, decided against enforcing a 1990 support order obligating the mother to pay $50 per week to the father.