In addition, where there is joint custody, the child is considered to have two custodial parents and no non-custodial parents, thus a custodial parent (obligor) will be required to pay the other custodial parent (obligee).
The child is considered to have two custodial parents. This was in addition. The child is considered to have no non-custodial parents. This was in addition. There is joint custody. A custodial parent (obligor) will be required to pay the other custodial parent (obligee). This was in addition.