In a letter dated July 25, 1787 from her estate at Burton Pynsent, Lady Hester, the Dowager Countess of Chatham, wrote to her son in-law Edward Eliot. Amongst other observations of life, with much prominence given to little anecdotes of her baby granddaughter Harriot Hester (Eliot's child, and that of her late daughter Lady Harriot Eliot), Lady Hester writes that she hopes "you [Eliot] have had the pleasure of finding the dear Lord of Hol-wood [in other words, her son William Pitt] in perfect health, as well as in the hope of being able to let me and his friends here enjoy soon the great happiness of seeing him here."
She signs off her letter with "Kindest of kind love to my dear William and believe me my dear son, your most affect. Mother, H. Ch."
Cambridge University Library, Department of University Archives and Manuscripts, William Pitt Papers, Add Ms 6958 f. 389.