Background
Natashia Villanueva (Mother) and Cord Bowers (Father) divorced in Texas in 2015. After Father relocated to Mohave County, Arizona, Mother — then living in Ohio — registered the Texas decree in Arizona and petitioned in 2024 to modify legal decision-making authority, parenting time, and child support. The superior court found a significant and continuing change in circumstances and entered a modified order granting Father sole legal decision-making authority and designating him the primary residential parent, with Mother’s parenting time confined to holidays and school breaks exercised in Mohave County.
Most significantly for the appeal, the superior court more than quintupled Mother’s child support obligation — from $344.54 per month to $1,997 per month. The court found Mother’s claimed gross monthly income of $2,511 not credible in light of $10,480 in monthly expenses listed in her own Affidavit of Financial Information, and concluded she earned at least $10,000 per month. Mother had submitted no tax returns, pay stubs, or wage statements, had not filed tax returns for the prior two years, and gave only vague testimony that her business income varied from roughly $2,300 in slow winter months to as much as $35,000–$40,000 in good months.
Mother appealed the modification order. Her opening and reply briefs cited a non-existent case, cases with impossible pin cites, and a pre-2015 memorandum decision that Arizona rules prohibit citing as authority. When Father flagged these errors, Mother denied them in her reply brief. Only after the Court of Appeals ordered a supplemental brief did Mother admit she had used generative AI to draft her briefs and had failed to verify the accuracy of the citations.
The Court’s Holding
The Court of Appeals vacated the child support order and remanded for recalculation. It agreed with the superior court that Mother failed to present credible evidence of her income and that the trial court did not abuse its discretion by using her monthly expenses as a proxy for income in the absence of reliable documentation. The court also rejected Mother’s argument that the Guidelines’ income-attribution factors applied, reasoning that the trial court was not attributing income to an underemployed parent — it was simply determining the actual amount of income Mother earned, a pure credibility and fact-finding question.
The remand was required, however, because $3,400 of the $10,000 in monthly expenses the superior court relied upon were “anticipated” future expenses for the children — not actual current expenses Mother was paying. Because the trial court was using expenses as a proxy for present income, it could only count expenses Mother was actually incurring. Including projected future costs overstated the income figure and thus produced an unsupported support amount.
On the AI-brief issue, the court declined to find waiver of Mother’s child support arguments despite her defective briefing, because child support implicates the best interests of the children and waiver in that context is disfavored. The court did, however, award Father his reasonable attorney fees and costs under A.R.S. § 25-324, characterizing Mother’s conduct — submitting false citations, denying the errors when challenged, and lying to the court in her reply brief — as unreasonable. Mother’s own fee request was denied both for failure to cite applicable authority and for raising the request for the first time in her reply brief.
Key Takeaways
- A trial court may use a parent’s own reported monthly expenses as a proxy for income when the parent provides no credible documentation of earnings, but the calculation must be limited to actual current expenses — not anticipated or future costs.
- The Guidelines’ factors for attributing income to an underemployed parent do not apply when the dispute is over how much a fully-employed parent actually earns; that is a straightforward credibility determination reviewed only for clear error.
- Arizona appellate courts will not find waiver of inadequately briefed arguments when the substantive issue directly affects a child’s best interests, including child support calculations.
- Using generative AI to draft briefs without verifying citations is an independent basis for sanctions: the court awarded appellate attorney fees against Mother under A.R.S. § 25-324 after she submitted fabricated authority and then denied the errors when confronted.
Why It Matters
This decision adds to a growing body of appellate authority scrutinizing AI-assisted legal filings. The court’s treatment is notable for two reasons: it refused to let children suffer for their parent’s defective briefing by preserving review of the child support issue, while simultaneously imposing fee sanctions on the parent whose misconduct caused the problem. The opinion signals that Arizona courts will look beyond procedural default when a child’s welfare is at stake, but will not ignore the professional responsibility consequences of submitting unverified AI-generated citations.
On the substantive side, the decision offers useful guidance for family law practitioners calculating income from self-employment. It confirms that a trial court need not accept a self-employed parent’s vague, undocumented income testimony, and that an expense-based income inference is permissible — but only as to expenses the parent is actually bearing at the time of the hearing. Practitioners should carefully parse an opposing party’s AFI to distinguish current from anticipated expenses whenever income is in dispute.