26. (1) Subject to the provisions of section 28 of this Constitution, a person to whom the provisions of this section apply may be registered as a citizen of Nigeria, if the President is satisfied that -

(a) he is a person of good character;

(b) he has shown a clear intention of his desire to be domiciled in Nigeria; and

(c) he has taken the Oath of Allegiance prescribed in the Seventh Schedule to this Constitution.

(2) the provisions of this section shall apply to-

(a) any woman who is or has been married to a citizen of Nigeria; or

(b) every person of full age and capacity born outside Nigeria any of whose grandparents is a citizen of Nigeria.