After the parties’ children moved to their father, Anthony Moore, the trial court modified custody and support terms from their divorce decree, awarded him physical custody of one child, and set Janeene McKinney’s support obligations. The court ruled that the February 2014 agreement could not end Moore’s support retroactively or require McKinney to repay the January payment; the improper effective date also skewed the back-support calculation. It separately held that the final order had to require the parents to share the child’s uninsured health-care expenses under the governing statute. The court vacated the child-support order and remanded for recalculation and inclusion of the required expense-sharing terms. It left Moore’s other appellate arguments for consideration on remand.