Wesley earned a substantial amount of money writing the screenplays for the 1974 film Uptown Saturday Night and the following year's Let's Do It Again, both of which starred Bill Cosby and Sidney Poitier.
He was the eldest son of son of Henry Colley and Mary, daughter of Sir William Ussher; brother of Henry Colley, father of Garret Wesley, 1st Earl of Mornington, father-in-law to Chichester Fortescue and William Francis Crosbie, and grandfather of Arthur Wellesley, 1st Duke of Wellington and Richard Wellesley, 1st Marquess Wellesley.
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