Passage: Satyajit Ray's ancestry can be traced back for at least ten generations. Ray's grandfather, Upendrakishore Ray was a writer, illustrator, philosopher, publisher, amateur astronomer and a leader of the Brahmo Samaj, a religious and social movement in nineteenth century Bengal. He also set up a printing press by the name of U. Ray and Sons, which formed a crucial backdrop to Satyajit's life. Sukumar Ray, Upendrakishore's son and father of Satyajit, was a pioneering Bengali writer of nonsense rhyme (Abol tabol) and children's literature, an illustrator and a critic. Ray was born to Sukumar and Suprabha Ray in Calcutta.

Question: Which of Satyajit Ray's relatives was a famous intellectual?
grandfather