Wentworth-FitzWilliam was the second son of William Wentworth-FitzWilliam, 6th Earl FitzWilliam, and Lady Frances Harriet, daughter of George Douglas, 17th Earl of Morton.
He later represented the West Riding of Yorkshire South between 1880 and 1885 and Doncaster between 1888 and 1892.
Wentworth-FitzWilliam married Lady Mary Grace Louisa, daughter of John Butler, 2nd Marquess of Ormonde, in 1877.
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