Question: What is the date of birth of Eliza Courtney's father?
Sentence (from "Eliza Courtney"): Eliza Courtney (20 February 1792 – 2 May 1859) was the illegitimate daughter of the Whig politician and future Prime Minister Charles Grey, 2nd Earl Grey, and socialite Georgiana, Duchess of Devonshire, while Georgiana was married to William Cavendish, 5th Duke of Devonshire.
Relevant evidence: Yes