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His father, William Harcourt Isham Mackworth (1806—1872), a younger son of Sir Digby Mackworth, the 3rd Baronet, took the additional surname Dolben after he married Frances, the heiress of Sir John English Dolben, the 4th Baronet.
Her children included: Cecil Bisshopp, 12th Baron Zouche, Harriett Lady Dunce, Anne wife of Hon. Robert Brudenell whose son was 6th Earl of Cardigan; Charlotte Lady Maynard, Frances Lady Warren Maid of honour to Queen Charlotte 1761-4, Catherine Countess of Liverpool, Baroness Hawkesbury among others.