For the purposes of availing of the facilities of opening and maintenance of bank accounts and investments in shares / securities in India:

• A foreign citizen (other than a citizen of Pakistan or Bangladesh) is deemed to be of India origin, if,
  he, at any time, held an Indian passport.
• he or either of his parents or any of his grand parents was a citizen of India by virtue of the constitution of India or Citizenship Act, 1955 (57 of 1955)
• Note: A spouse (not being a citizen of Pakistan or Bangladesh) of an Indian citizen or of a person of Indian origin is also treated as a person of Indian origin for the above purposes provided the bank accounts are opened or investments in shares/securities in India are made by such persons only jointly with their NRI spouses.
• For investments in immovable properties. A foreign citizen (other than a citizen of Pakistan, Bangladesh, Afghanistan, Bhutan, Sri Lanka or Nepal), is deemed to be of Indian origin if,
• he held an Indian Passport at any time,
• he or his father or parental grand-father was a citizen of India by virtue of the constitution of India or the Citizenship Act, 1955 (57 of 1955)