- Father of Lord Blandford, now the 12th Duke of Marlborough, and Lady Henrietta Spencer-Churchill. Brother of Rosemary Spencer-Churchill and Sarah Consuelo Spencer-Churchill. Uncle of Serena Balfour.
- Grandson of Consuelo Vanderbilt. Great-nephew of William K. Vanderbilt. Second cousin of Mrs. Earl E.T. Smith. Great-grandson of Alva Vanderbilt. Great-great-great grandson of Cornelius Vanderbilt.
- His second wife was the first wife of Aristotle Onassis.
- 11th Duke of Marlborough (March 11, 1972 - October 16, 2014).
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