A Missouri court handling child custody may step aside if another state is a better forum, and it must consider relevant factors before deciding.
452.770. Inconvenient forum. — 1. A court of this state that has jurisdiction under sections 452.700 to 452.930 to make a child custody determination may decline to exercise its jurisdiction at any time if the court determines that it is an inconvenient forum under the circumstances and that a court of another state is a more appropriate forum. The issue of inconvenient forum may be raised upon the court's own motion, at the request of another court or upon motion of a party. 2. Before determining whether the court is an inconvenient forum, a court of this state shall consider whether it is appropriate that a court of another state exercise jurisdiction. For this purpose, the court shall allow the parties to submit information and shall consider all relevant factors, including: (1) Whether domestic violence has occurred and is likely to continue in the future and which state could best protect the parties and the child; (2) The length of time the child has resided outside this state; (3) The distance between the court in this state and the court in the state that would assume jurisdiction; (4) The relative financial circumstances of the parties; (5) Any agreement of the parties as to which state should assume jurisdiction; (6) The nature and location of the evidence required to resolve the pending litigation, including the testimony of the child; (7) The ability of the court of each state to decide the issue expeditiously and the procedures necessary to present the evidence; and (8) The familiarity of the court of each state with the facts and issues of the pending litigation. 3. If a court of this state determines that it is an inconvenient forum and that a court of another state is a more appropriate forum, the court shall stay the proceedings on the condition that a child custody proceeding be promptly commenced in another designated state and may impose any other condition the court considers just and proper. 4. A court of this state may decline to exercise its jurisdiction under sections 452.700 to 452.930 if a child custody determination is incidental to an action for divorce or another proceeding while still retaining jurisdiction over the divorce or other proceeding. (L. 2009 H.B. 481)