He had no children and the title became an additional title of the Marquess of Lansdowne, descendants of his uncle John Petty, 1st Earl of Shelburne.
John Petty, 2nd Marquess of Lansdowne (1765–1809), son of former Prime Minister of Great Britain, William Petty, 1st Marquess of Lansdowne
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John Petty, 1st Earl of Shelburne (1706–1761), politician, father to former Prime Minister of Great Britain, William Petty, 2nd Earl of Shelburne
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