[5] Her maternal grandparents were James Roche, 3rd Baron Fermoy and Frances Ellen Work, and her mother's siblings were Maurice Roche, 4th Baron Fermoy (the maternal grandfather of Diana, Princess of Wales), and the Hon.
[9] Cynthia's parents resided at 61 East 91st Street in Manhattan and at "Oak Hill" in Jericho, New York.
[11] On August 23, 1947, she was married to Charles Bingham Penrose Van Pelt (1922–2003) at Trinity Protestant Episcopal Church in Newport, Rhode Island.
[10] A lawyer, he graduated from Groton, Harvard and the University of Pennsylvania Law School and served in the U.S. Army Military Intelligence in the Pacific during the War.
[18][20] He married Iris Paine (daughter of Ambassador Earl E. T. Smith) after Lady Sarah and before Cynthia.