Tex. Civ. Prac. & Rem. Code § 15.003
(a) In a suit in which there is more than one plaintiff, whether the plaintiffs are included by joinder, by intervention, because the lawsuit was begun by more than one plaintiff, or otherwise, each plaintiff must, independently of every other plaintiff, establish proper venue. If a plaintiff cannot independently establish proper venue, that plaintiff's part of the suit, including all of that plaintiff's claims and causes of action, must be transferred to a county of proper venue or dismissed, as is appropriate, unless that plaintiff, independently of every other plaintiff, establishes that:
(b) An interlocutory appeal may be taken of a trial court's determination under Subsection (a) that:
(c) An interlocutory appeal permitted by Subsection (b) must be taken to the court of appeals district in which the trial court is located under the procedures established for interlocutory appeals, except that an interlocutory appeal from the business court must be taken to the Fifteenth Court of Appeals. The appeal may be taken by a party that is affected by the trial court's determination under Subsection (a). The court of appeals shall:
Added by Acts 1995, 74th Leg., ch. 138, Sec. 1, eff. Aug. 28, 1995.
Amended by Acts 2003, 78th Leg., ch. 204, Sec. 3.03, eff. Sept. 1, 2003.
Acts 2025, 89th Leg., R.S., Ch. 912 (H.B. 40), Sec. 2, eff. September 1, 2025.