The Citizenship Act, 1955Central Act · Act 57 of 1955
(1) If any citizen of India of full age and capacity, * * *, makes in the prescribed manner a declaration renouncing his Indian Citizenship, the declaration shall be registered by the prescribed authority; and, upon such registration, that person shall cease to be a citizen of India:
Provided that if any such declaration is made during any war in which India may be engaged, registration thereof shall be withheld until the Central Government otherwise directs.
(2) Where [a person] ceases to be a citizen of India under sub-section (1), every minor child of that person shall thereupon cease to be a citizen of India:
Provided that any such child may, within one year after attaining full age, make a declaration [in the prescribed form and manner] that he wishes to resume Indian citizenship and shall thereupon again become a citizen of India.