On 17 June 1786, he married secondly Mary Monckton, daughter of the 1st Viscount Galway: her salon was one of the centres of intellectual life in London for half a century.
He had also an illegittimate son with Julia Fane, wife of Robert Monckton; their son was the 1st Viscount Galway.
Pitt resigned as governor in 1735 with a considerable fortune, purchased what later became known as Orleans House Twickenham from the estate of James Johnston who died in 1737 and bought in January 1740 burgages and freeholds from Sir William Lowther which with Lord Galway's interest gave complete control of the Pontefract seat.
The first house on the site was built 1740 by James Paine for John Monckton, 1st Viscount Galway, who had bought the 500 acre Serleby estate from the Saunderson family of Blyth.
The fourth creation came in the Peerage of Ireland in 1727 when John Monckton was made Baron Killard, of the County of Clare, and Viscount Galway.
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