Provided that if the 5[ father or mother] of such person is a citizen of Bangladesh by descent only, that person shall not be a citizen of Bangladesh by virtue of this section unless- (a) that person's birth having occurred in a country outside Bangladesh the birth is registered at a Bangladesh Consulate or Mission in that country, or where there is no Bangladesh Consulate or Mission in that country at the prescribed Consulate or Mission or at a Bangladesh Consulate or Mission in the country nearest to that country; or (b) that person's 6[ father or mother] is, at the time of the birth, in the service of any Government in Bangladesh. Citizenship by migration 6. (1) The Government may, upon his obtaining a certificate of domicile under this Act, register as a citizen of Bangladesh by migration any person who after the commencement of this Act and before the first day of January, 1952, has migrated to the territories now included in Bangladesh from any territory in the Indo-Pakistan sub-continent outside those territories, with the intention of residing permanently in those territories: Provided that the Government may, by general or special order, exempt any person or class of persons from obtaining a certificate of domicile required under this sub-section. (2) Registration granted under the preceding sub-section shall include, besides the person himself, his wife, if any, unless his marriage with her has been dissolved, and any minor child of his dependent whether wholly or partially upon him. Persons migrating from the territories of Bangladesh 7. Notwithstanding anything in sections 3, 4 and 6, a person who has after the first day of March, 1947, migrated from the territories now included in Bangladesh to the territories now included in India shall not be a citizen of Bangladesh under the provisions of these sections: Provided that nothing in this section shall apply to a person who, after having so migrated to the territories now included in India has returned to the territories now included in Bangladesh under a permit for resettlement or permanent return issued by or under the authority of any law for the time being in force.