Lady Sophia Carteret first wife of William Petty, 2nd Earl of Shelburne; daughter of John Carteret, 2nd Earl Granville (1745-1771) (1745–1771) Parents John Carteret, 2nd Earl Granville Lady Sophia Fermor Children John Petty, 2nd Marquess of Lansdowne Siblings Robert Carteret George Carteret Louisa Thynne, Viscountess Weymouth Lady Grace Carteret Georgiana Clavering-Cowper, Countess Cowper Frances Hay, Marchioness of Tweedsdale Partners William Petty, 2nd Earl of Shelburne