Simultaneous proceedings.

A tribunal of the District may exercise jurisdiction to establish a support order if the petition or comparable pleading is filed after a pleading is filed in another state or a foreign country only if: The petition or comparable pleading in the District is filed before the expiration of the time allowed in the other state or the foreign country for filing a responsive pleading challenging the exercise of jurisdiction by the other state or the foreign country; The contesting party timely challenges the exercise of jurisdiction in the other state or the foreign country; and If relevant, the District is the home state of the child. A tribunal of the District may not exercise jurisdiction to establish a support order if the petition or comparable pleading is filed before a petition or comparable pleading is filed in another state or a foreign country if: The petition or comparable pleading in the other state or foreign country is filed before the expiration of the time allowed in the District for filing a responsive pleading challenging the exercise of jurisdiction by the District; The contesting party timely challenges the exercise of jurisdiction in the District; and If relevant, the other state or foreign country is the home state of the child.