Section 156.408 - Modification of Support Order Rendered By Another State(a) Unless both parties and the child reside in this state, a court of this state may modify an order of child support rendered by an appropriate tribunal of another state only as provided by Chapter 159.(b) If both parties and the child reside in this state, a court of this state may modify an order of child support rendered by an appropriate tribunal of another state after registration of the order as provided by Chapter 159.Amended by Acts 2001, 77th Leg., ch. 1023, Sec. 13, eff. 9/1/2001.Added by Acts 1995, 74th Leg., ch. 20, Sec. 1, eff. 4/20/1995.