Mo. Rev. Stat. § 454.1668: Jurisdiction to modify child support order of another state when individual parties reside in this state.

(a) If all of the parties who are individuals reside in this state and the child does not reside in the issuing state, a tribunal of this state has jurisdiction to enforce and to modify the issuing state's child support order in a proceeding to register that order.

(b) A tribunal of this state exercising jurisdiction under this section shall apply the provisions of Articles 1 and 2, sections 454.1500 to 454.1545; this article, sections 454.1632 to 454.1677, and the procedural and substantive law of this state to the proceeding for enforcement or modification. Article 3, sections 454.1548 to 454.1602; Article 4, sections 454.1605 to 454.1608; Article 5, sections 454.1611 to 454.1629, Article 7, sections 454.1680 to 454.1716; and Article 8, sections 454.1719 to 454.1722, do not apply.