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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.
Born posthumously at Whitehall, he was the only son of Sir Brook Bridges, 2nd Baronet and his wife Anne Palmer, daughter of Sir Thomas Palmer, 4th Baronet, of Wingham.