Known informally as "Fergie", Sarah once described her family as "country gentry with a bit of old money". She is a descendant of King Charles II of England via three of his illegitimate children: Charles Lennox, 1st Duke of Richmond, James Scott, 1st Duke of Monmouth, and Anne Lennard, Countess of Sussex. She has aristocratic ancestry, being the great-great-granddaughter of the 6th Duke of Buccleuch, a great-granddaughter of the 8th Viscount Powerscourt and a descendant of the 1st Duke of Abercorn and of the 4th Duke of Devonshire. Sarah and her former husband, Andrew, are distantly related, as they are both descended from the Duke of Devonshire as well as King James VI and I.