Among the descendents of Major General Holburne are Sir Alexander Holburn, 3rd Baronet, Vice-Admiral Sir Francis Holburne, and Thomas William Holborne, founder of the Holburne Museum of Art in Bath, all of whom served in the Royal Navy.
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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.