This question has been addressed in 1 Texas court opinion:
COA01 — February 19, 2026
In Spruell v. Martinez, an appellant sought to challenge a family law order but failed to file her appellate brief by the required deadline. Despite receiving a formal warning from the First Court of Appeals that her case was at risk of dismissal, the appellant did not file the brief or request an extension. The court analyzed the case under Texas Rule of Appellate Procedure 42.3, which allows for the involuntary dismissal of an appeal when a party fails to comply with procedural requirements or court notices. Because the appellant ignored the court's delinquency notice, the court held that the appeal must be dismissed for want of prosecution, effectively ending the case without reviewing the underlying legal merits.
Litigation Takeaway
“Appellate deadlines are strict and unforgiving; failing to file a brief or respond to a court's warning will result in the permanent loss of your right to appeal, regardless of the merits of your case.”