Harris Cnty. Fam. Div. L. R. 2.1
When a suit filed in a Family Trial Division court is in any way terminated (by non-suit or otherwise), a subsequent suit or cause of action involving the same parties or the same subject matter shall be filed in, or transferred to, the court that first had jurisdiction of the parties or subject matter. This rule applies to all controversies, including divorce, support, conservatorship, and all matters incident to them, whether sought by original proceedings or by modification, clarification or enforcement of a former order, judgment or settlement agreement. When such a situation is disclosed for the first time after the hearing begins, the judge of the court shall immediately order the suit transferred to the court in which the prior suit was filed.
Harris Cnty. Fam. Div. L. R. 2.1