(1) Where by reason of infancy, mental illness or defect or any other cause, any person interested in a ship or share therein is incapable of making any declaration or doing any act required or permitted by this Act to be made or done in connection with the registration of the ship, or any share therein, the legal guardian or representative of that person, or the committee, manager or other administrator of his or her estate, or if there is no such guardian, representative, committee, manager or administrator, any person appointed by any court of competent jurisdiction on application made on behalf of the incapable person or of any other person interested, may make that declaration, or a declaration as nearly corresponding thereto as circumstances permit, and do that act in the name and on behalf of the incapable person.