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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.
He died at 30 years of age on 8 June 1886 of cirrhosis of the liver and was buried at Loughgall in Ireland.