Sarah Mendez da Costa was the daughter of Abraham Mendez da Costa (died 1782) and his wife Elizabeth Leigh. Sarah's grandfather, Daniel Mendez da Costa, was a Sephardic Jewish merchant in Jamaica.Lucien Wolf, "Mrs. Brydges Willyams and Benjamin Disraeli" Miscellanies (Jewish Historical Society of England) 1(1925): xx. She married Col. James Brydges Williams, commander of the Cornish militia.William Flavel Monypenny and George Earl Buckle, The Life of Benjamin Disraeli, Earl of Beaconsfield Vol. 3 (Macmillan 1914): 452-473. His nephew was Edward Brydges Willyams, a Member of Parliament and sheriff of Cornwall.Edward Brydges-Willyams, National Portrait Gallery.
