Sir Thomas Grosvenor, 3rd Baronet married Mary Davis, heiress to part of the Manor of Ebury, in 1677; the Grosvenor family gained 40 hectares (100 acres) of Mayfair.
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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.