After Edgar married again in 1980, then was again divorced, the two sisters visited their father at his homes in the US: outside Charlottesville, Virginia; in Westchester County; at Sun Valley; and on Fifth Avenue in New York City, though their lives were centered in England and in Kenya, with their mother.

NXIVM was a multi-level marketing organization founded by Keith Raniere that claimed to help individuals achieve self-discovery, offering personal and professional development seminars, but has subsequently been identified as a cult.

Clare was then committed to her equestrian career as a competitive jumper, horse trainer and owner of Slate River Farm; she was described as being "a bit withdrawn and certainly the type to stay in and read while everyone else goes out.

[10] "As Sara would later explain on her blog," wrote Suzanna Andrews in a profile of the sisters for Vanity Fair, "she was 'in search of finding ways to bring peace to the world.'

[12] In September 2018, a class-action lawsuit was filed against Bronfman in the Brooklyn Supreme Court, asserting that she "ensnared" Isabella Martinez and Gabrielle Leal, among others, into taking costly classes as part of "a fraudulent scheme nationwide" for Raniere and NXIVM.

[13] Bronfman and her husband founded the Athal Education Group, a France-based offshoot of Raniere's Rainbow Cultural Garden, as well as the UK branch of RCG itself.

[21] Sara, along with her sister, Clare Bronfman, and NXIVM founder Keith Raniere formed an organization called the World Ethical Foundations Consortium (WEFC).

[32][33] In November 2011, Sara Bronfman traveled to Libya with fellow NXIVM member (and future spouse) Basit Igtet, accompanied by consultants including Adam Hock and Joseph Hagin.