Marion Stuart was the wife of James Stirling, 10th of Keir (1679-1749), a keen Jacobite, and the eldest daughter of Alexander, 5th Lord Blantyre, a determined supporter of the Revolution. After her marriage in February 1704, she lived to see her husband acquitted of charges of high treason in 1708, attainted for his part in the Fifteen, imprisoned for interfering with elections and receiving Jacobite couriers in 1727 and imprisoned again during the Forty-five. Her second brother, Robert, 7th Lord Blantyre (d.1743), was one of the friends and relations who bought back the estate after the forfeiture in 1715 and give it to her eldest son, John. She died on 20 March 1770, the mother of twenty-two children.