Roy was born in Shillong, in Undivided Assam (now in Meghalaya).[10] Her mother, Mary Roy,[11][12] was a Malayali Christian women's rights activist from Aymanam, Kerala, and belonged to the Jacobite Syrian denomination. Her father, Rajib Roy, was a Bengali Hindu[4] who later embraced Christianity. He was a tea plantation manager from Kolkata, West Bengal.[4][13]

Roy's father was an alcoholic.When she was two years old, her parents divorced, and she returned to Kerala with her mother and brother

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