- Great-granddaughter of Cornelius Vanderbilt. Daughter of Alva Vanderbilt. Step-daughter of Anne Harriman-Vanderbilt. Sister of William K. Vanderbilt. Sister-in-law of Mrs. William K. Vanderbilt. Aunt of Mrs. Earl E.T. Smith.
- Grandmother of Rosemary Spencer-Churchill, John Spencer-Churchill, and Sarah Consuelo Spencer-Churchill. Great-grandmother of Serena Balfour, Lady Henrietta Spencer-Churchill, and Lord Blandford.
- Among her admirers was J.M. Barrie, who said of her: "I would stand all day in the street to see Consuelo Marlborough get into her carriage.".
- Her first husband was a first cousin of Winston Churchill, whom became her close friend and confidant.
- Secretly engaged to Winthrop Rutherfurd, Consuelo's mother, Alva, forced her to travel to Europe to meet Charles Spencer-Churchill, 9th Duke of Marlborough. She agreed to forsake Rutherfurd only after Alva said she would die of a heart attack if Consuelo didn't marry Marlborough. Alva's admission that she pressured Consuelo to marry Marlborough was the basis for the Vatican granting Marlborough an annulment in 1926. Rutherfurd's second wife was Lucy Mercer, mistress of Franklin D. Roosevelt.
- Although they divorced in 1921, she agreed to Charles Spencer-Churchill's request for an annulment, which was granted by the Vatican on August 19, 1926.
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