Mukherjee was married when he was a teenager to Sati Devi Mukherjee (nee Ganguli), a teenage girl of his own Bengali Hindu community and similar family background, in a match arranged by their parents in the usual Indian way. Sati Devi's father was also in government service, and that family was also settled in the Hindi-speaking provinces; resultantly, both families spoke Hindi with native-level fluency. This proved important because, mostly due to Mukherjee's influence, all three of Sati Devi's brothers were to become actors and big names in the Hindi film industry. Her brothers were the venerable actor Ashok Kumar, Anoop Kumar and Kishore Kumar, who was an actor, but more famously a playback singer. Sasadhar Mukherjee was instrumental in helping his own brothers and his wife's brothers to establish themselves in the film industry, and this is perhaps his most important and enduring contribution to Indian films.