Texas Family Code - FAM § 155.301. Authority to Transfer

(a) A court of this state with continuing, exclusive jurisdiction over a child custody proceeding under Chapter 152 or a child support proceeding under Chapter 159 shall transfer the proceeding to the county of residence of the resident party if one party is a resident of this state and all other parties including the child or all of the children affected by the proceeding reside outside this state.

(b) If one or more of the parties affected by the proceedings reside outside the state and if more than one party or one or more children affected by the proceeding reside in this state in different counties, the court shall transfer the proceeding according to the following priorities:

(c) Except as otherwise provided by this subsection, if a transfer of continuing, exclusive jurisdiction is sought under this section, the procedures for determining and effecting a transfer of proceedings provided by this chapter apply. If the parties submit to the court an agreed order for transfer, the court shall sign the order without the need for other pleadings.