Consuelo Vanderbilt was born 2 March 1877 to William Vanderbilt I and Alva Smith in New York City, New York. Consuelo was named after her godmother, Consuelo Yznaga, her mother's best friend.
Consuelo was dominated by her mother and her first marriage was forced on her, despite her being secretly engaged to Winthrop Rutherfurd. She was married to Charles Spencer-Churchill, the 9th Duck of Malborough on 6 November 1895 at St. Thomas Espiscopal Church in New York City. They had two sons. Their marriage became that of name only and Consuelo briefly was smitten with her husband's cousin, Reginald Fellowes. In 1906 Consuelo and Charles separated and then divorced in 1921. The marriage was annulled on 19 August 1926.
Consuelo married Jacques Balsan on 4 July 1921 at the Registry Office on Henrietta Street in London, England. Jacques died in 1956.
Consuelo died on 6 December 1964 at Southampton, Long Island, New York. She is buried at St. Martin Churchyard in Bladon, Oxfordshire, England.
Sunderland House in London, England was built for Consuelo by her father 
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Consuelo's mother was Alva Erskine (Smith) Vanderbilt- Belmont. Her father was William Kissam Vanderbilt. Her mother, Alva was a force to be reckoned with and first to divorce in her society. She later married Oliver Hazard Perry Belmont. They owned Marble house; Belcourt Castle in Newport among many other properties. Consuelo was bargained off for an English title to the 8th Duke of Marlborough- Charles Spencer Churchill and during their loveless marriage he became involved with an American anmed Gladys Deacon which caused a scandal back then. He divorced Consuelo who later remarried a Frenchman and wed Gladys- Gladys ended up in an insane asylum. Consuelo's father gave the Duke $2,500, 000 in dowry money as well as shares of capital stock. They lived at Blenheim castle in England. Vanderbilt is derived from : van der :from the village of Debilt, Holland.
It may be possible to confirm family relationships with Consuelo by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Consuelo: