Robert Bertie, 4th Duke of Ancaster and Kesteven British peer (1756–1779) Parents Mary Bertie, Duchess of Ancaster and Kesteven Peregrine Bertie, 3rd Duke of Ancaster and Kesteven Children Susan Priscilla Bertie Siblings Priscilla Bertie, 21st Baroness Willoughby de Eresby unknown daughter Bertie Georgina Cholmondeley, Marchioness of Cholmondeley Peregrine Thomas Bertie, Marquess of Lindsey
