When can I use a writ of mandamus to challenge a court order in Texas?
This question has been addressed in 4 Texas court opinions:
Bustamante v. Bustamante
COA01 — February 3, 2026
In Bustamante v. Bustamante, the First Court of Appeals addressed whether a trial court's order granting a bill of review—which vacated a prior 2023 judgment without resolving the underlying merits—could be immediately appealed. The court analyzed Texas jurisdictional principles, noting that appellate review is generally limited to final judgments unless a statute specifically authorizes an interlocutory appeal. Because the order only 're-opened' the litigation and did not fall under the authorized list of interlocutory appeals in the Texas Civil Practice and Remedies Code, the court held it lacked jurisdiction and dismissed the appeal.
Litigation Takeaway
“The granting of a bill of review is a non-appealable interlocutory order if the underlying merits remain unresolved. Practitioners must proceed through a second trial on the merits before they can challenge the propriety of the bill of review on appeal.”
In the Interest of A.J., A Child
COA12 — February 18, 2026
The Twelfth Court of Appeals affirmed a jury verdict appointing paternal grandparents as joint managing conservators with the right to designate the child's primary residence. The parents challenged the grandparents' standing to intervene and the trial court's admission of third-party psychological evaluations. The court held that the standing issue was previously settled in a mandamus proceeding and could not be relitigated. Furthermore, the court determined that even if the psychological reports were improperly admitted as hearsay, the error was harmless because the parents failed to object to subsequent testimony discussing the contents of those reports, making the evidence cumulative.
Litigation Takeaway
“Winning an evidentiary objection to a document is not enough if you allow witnesses to testify about that document's contents without further objection. To avoid the 'cumulative evidence' trap, practitioners must secure a running objection to ensure that similar testimony doesn't waive the initial error on appeal.”
In re Elizabeth Cavazos
COA05 — February 23, 2026
Relator Elizabeth Cavazos sought a writ of mandamus and an emergency stay after a Dallas trial court struck her trial exhibits and related testimony on the eve of trial. The Dallas Court of Appeals analyzed the petition under the newly amended Texas Rule of Appellate Procedure 52.3(k), which updated certification requirements in December 2025, and the established 'Prudential' standard for extraordinary relief. The court denied the petition, holding that the Relator's failure to include the mandatory certification language was a fatal procedural defect and, substantively, that the Relator failed to demonstrate that the evidentiary ruling lacked an adequate remedy by ordinary appeal.
Litigation Takeaway
“In mandamus practice, technical compliance is just as critical as substantive merit; using outdated templates that fail to incorporate the December 2025 TRAP 52.3(k) certification language will result in summary denial, even in emergency circumstances. Furthermore, remember that striking evidence is rarely a 'mandamus-able' event unless it effectively terminates a party's ability to present their case entirely.”
In re Mitsubishi Heavy Industries America, Inc.
COA09 — February 20, 2026
In re Mitsubishi Heavy Industries America, Inc. involved a discovery dispute where a relator sought to shield alleged trade secrets from production. The Beaumont Court of Appeals analyzed the burden-shifting framework of Texas Rule of Evidence 507 and the procedural requirements of Rule of Civil Procedure 193.3, concluding that the relator provided only general categorical descriptions of documents rather than a specific privilege log. The court held that the relator's failure to affirmatively request an in-camera inspection prevented the trial court from making a reasoned determination on the privilege, thereby rendering the petition for mandamus relief premature.
Litigation Takeaway
“To successfully protect trade secrets or proprietary business information in discovery, you must do more than simply object; you must provide a detailed privilege log and formally request an in-camera inspection. Failing to provide the trial court with the specific documents for review waives your ability to seek mandamus relief, as the appellate court cannot find an abuse of discretion without a record of the specific evidence at issue.”