A court may order one joint managing conservator to pay Texas child support to another joint managing conservator. Tex. Fam. Code Ann. § 153.138. The child’s best interest is the primary consideration in determining child support. There may, therefore, be occasions where a court orders the parent with primary physical custody to nonetheless pay child support to the other parent, when they are both joint managing conservators. A mother recently challenged an order to pay child support when she had been awarded the exclusive right to determine the child’s primary residence.