The well-funded Christian missionaries gave him support and patronage; guided by his new friends, he won the Gilchrist Scholarship to go to England.

Roy's education in London and links with the British establishment made him a prize catch for marriage, and his estrangement from his family was an advantage in this context.

The marriage connected Roy to many leading lights of Bengali society who prospered under the colonial regime after accepting English education and a huge dose of European culture, not least in matters of religion.

Roy gave his daughter Charulata in marriage to Satish Chandra Mukherjee, the educationist; they became the parents of Air Marshal Subroto Mukerjee, first Indian Chief of Air Staff, the feminist and politician Renuka Ray and Prasanta Mukherjee, a General Manager employed by the Bengal Nagpur Railways.

Dutt, Accountant General of Bombay), Manorama Bose (a single woman; principal of Rani Birla College for Girls, Kolkata, and briefly Chief Inspector of Women's Education in West Bengal) and Anila Khastgir (married to Satish Ranjan Khastgir, Khaira Professor of Physics at Calcutta University).