Saklatvala was the son of Dorabji, a cotton merchant, and Jerbai, the youngest daughter of Jamsetji Nusserwanji Tata, who founded the Tata Group. When Saklatvala was 14 years old, his family moved into Esplanade House in Bombay to live with Jerbai’s brother (whose name was also Jamsetji) and his family. Saklatvala’s parents separated when he was young, so the younger Jamsetji became the main paternal figure in his life. “Jamsetji always had been especially fond of Shapurji and saw in him from a very early age the possibilities of great potential; he gave him a lot of attention and had great faith in his abilities, both as a boy and as a man,” Saklatvala’s daughter, Sehri, writes in The Fifth Commandment, a biography of her father. But Jamsetji’s fondness of Saklatvala made his elder son, Dorab, resent his younger cousin. “As boys and as men, they were always antagonistic towards each other; the breach was never healed,” Sehri writes. It would eventually lead to Dorab curtailing Saklatvala’s role in the family businesses, motivating him to pursue a different path. But apart from family dynamics, Saklatvala was also deeply influenced by the devastation caused by the bubonic plague in Bombay in the late 1890s. He saw how the epidemic disproportionately impacted the poor and working classes, while those in the upper echelons of society, including his family, remained relatively unscathed. During this time, Saklatvala, who was a college student, worked closely with Waldemar Haffkine, a Russian scientist who had to flee his country because of his revolutionist, anti-tsarist politics. Haffkine developed a vaccine to combat the plague, and Saklatvala went door-to-door, convincing people to inoculate themselves. “Their outlooks had much in common; and no doubt this close association between the idealist older scientist and the young, compassionate student, must have helped to form and to crystallize the convictions of Shapurji,” Sehri writes in the book.