Frances Hay, Marchioness of Tweedsdale English noble (1718–1788) (1718–1788) Parents Frances Worsley John Carteret, 2nd Earl Granville Children Lady Catherine Hay Lady Grace Hay John Hay Lady Susanna Hay George Hay, 5th Marquess of Tweeddale Siblings Louisa Thynne, Viscountess Weymouth Lady Grace Carteret Georgiana Clavering-Cowper, Countess Cowper Robert Carteret George Carteret Lady Sophia Carteret Partners John Hay, 4th Marquess of Tweeddale