Indian Nationality Law.

The conferment of a person , as a citizen of India is governed by Articles 5 to 11(part 2nd) of the constitution of India. The legislation related to this matter is the citizenship Act 1955,which has been amended by the citizenship (Amendment) Act 1986, the citizenship (Amendment)Act 1992, the citizenship (Amendment) Act 2003, The citizenship (Amendment) Act, 2005 and citizenship (Amendment) Act,2015.

Article 9 of Indian Constitution says that a person who voluntarily acquires citizenship of any other country is no longer an Indian citizen.Also, according to The passports Act, a person has to surrender his/her Indian passport and voter card and other Indian ID cards must not use after other contry citizenship.It is a punishable offence if the person fails to surrender the passport.

Indian nationality law largely follows the jus sanguinis (citizenship by right of blood) as opposed to the jus soli (citizenship by right of birth within the terroitory).The president of India is termed the first citizen of the india.   

The Citizenship Act, 1955
An Act to provide for acquisition and determination of Indian citizenship.
Citation	Act No 57 of 1955
Enacted by	Parliament of India
Date assented to	30 December 1955