What are the criteria for a person who has migrated from Pakistan to be considered a citizen of India at the commencement of the constitution?
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:

1. 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either of his parents or any of his grand-parents was born in India as defined in the Government of India Act, 1935 (as originally enacted).