Legal Question in Family Law in Texas

Rule 11 allows folks to make agreements for discovery deadlines, resetting of hearings, and even the final merits of a case. If a case is fully settled by a Rule 11 agreement (that is, it answers ALL the issues), it is signed by the parties (and/or their attorneys) and filed with the court; soon thereafter, it is reduced to a "written final order" form and submitted to the Judge for signature.

Without more information, I can't tell you whether or not you can fight to regain parental rights.