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Daughter of Sir John Houstoun, 12th of that Ilk and Agnes Campbell
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About Margaret Houstoun
"George Montgomerie of Skelmorlie, second son of Alexander, first Lord Montgomerie ... married Margaret, daughter of Sir John Houstoun of that Ilk."
SOURCE: History of the County of Ayr: with a genealogical account of the families of Ayrshire; James Paterson; 1852; Vol. II; page 309