Can someone become a citizen of India if their parents or grandparents were born in India as defined by the Government of India Act, 1935 (as originally enacted)?
Yes, a person can become a citizen of India if their parents or grandparents were born in India as defined by the Government of India Act, 1935 (as originally enacted). According to Article 6 of the Indian Constitution:

"Notwithstanding anything in article 5, a person who has migrated to the territory of India from the territory now included in Pakistan shall be deemed to be a citizen of India at the commencement of this Constitution if— (a) he or either of his parents or any of his grand-parents was born in India as defined in the Government of India Act, 1935 (as originally enacted);"