He was the son of Prince Simon Sidamon-Eristoff, a Georgian military officer, who emigrated to the United States after the Bolsheviks invaded Georgia in 1921 and Anne Tracy, a descendant of John Bigelow, an American diplomat in the mid-19th century.
In 1926, Simon Sidamon-Eristavi, then a widower, married, in New York City, his second wife, Anne Tracy (1890–1978), a descendant of John Bigelow, an American diplomat in the mid-19th century.
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In 1957 he married Anne Phipps Sidamon-Eristoff, a granddaughter of Andrew Carnegie's partner Henry Phipps.
Andrew Sidamon-Eristoff (b. 1963 - ), great-grandson of Henry W. Phipps, grandson of Howard Phipps