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TEXAS RULES OF CIVIL PROCEDURE / RULE 37
TRCP 37: Additional parties
Adding necessary or proper parties before trial without unreasonably delaying the trial.
Rule 37, illustrated

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Before a case is called for trial, additional parties necessary or proper parties to the suit, may be brought in, either by the plaintiff or the defendant, upon such terms as the court may prescribe; but not at a time nor in a manner to unreasonably delay the trial of the case.