context: Surya Sen was born in Noapara in Chittagong's Rausan thana on March 22, 2010 to an economically unhappy family. His father's name was Rajamani Sen and his mother's name was Shashi Bala Sen. Rajamani Sen has two sons and four daughters. Surya Sen is the fourth child of their family. The names of the two sons are Sun and Lotus. The four daughters are named Vardasundari, Savitri, Vanumati and Pramila. Surya Sen, who lost his parents to childhood, became a man to uncle Gauramani Sen.
question: What was the name of Master's father Suryakumar Sen?