Generally, the petition should be filed in the jurisdiction in which the person lives. You may be able to file in the District of Columbia if (1) the District of Columbia is the home state of the subject or (2) the subject has a significant connection with the District of Columbia and the subject does not have a home state, the home state has declined to exercise jurisdiction, or no petition is pending before the home state, or (3) the District of Columbia is neither a home state nor a significant connection state, but the home state and the significant connection state decline to exercise jurisdiction, and jurisdiction in the District of Columbia is more appropriate.