He was succeeded by his son, the fourth Earl. He briefly represented Leicestershire in the House of Commons. Lord Stamford married his second cousin once removed Lady Mary Booth, daughter of George Booth, 2nd Earl of Warrington (on whose death in 1758 the earldom of Warrington became extinct). When Harry Grey, 4th Earl of Stamford died the titles passed to his son, the fifth Earl; he sat as Member of Parliament for Staffordshire and served as Lord-Lieutenant of Cheshire. In 1796 the barony of Delamer (which became extinct in 1770) and earldom of Warrington held by his mother's family was revived by his creation as Baron Delamer and Earl of Warrington in the Peerage of Great Britain - he refused the offer of a marquessate, so as to become known as the Earl of Stamford and Warrington in recognition of the great estates he had inherited from the Booth family. He was succeeded by his son, the sixth Earl. He represented Aldborough and St Germans in Parliament and was Lord-Lieutenant of Cheshire. His son styled Lord Grey of Groby (1802–1835), was summoned to the House of Lords by a writ of acceleration in his father's subsidiary title of Baron Grey of Groby in 1833; he, however, predeceased his father. Lord Stamford was therefore succeeded by his grandson, the seventh Earl. He was the son of Lord Grey of Groby and had already succeeded as ninth Baron Grey of Groby on his father's death. Lord Stamford was a great patron of the Turf. On his death in 1883, the barony of Delamer and earldom of Warrington became extinct (although his wife remained Countess of Stamford and Warrington until her death in 1905).