Question: Who is Georgiana Cavendish, Duchess Of Devonshire's father-in-law?
Sentence (from "Georgiana Cavendish, Duchess of Devonshire"): Of noble birth from the Spencer family, married into the Cavendish family, she was the first wife of William Cavendish, 5th Duke of Devonshire, and the mother of the 6th Duke of Devonshire.
Relevant evidence: Yes