Lady Catherine Cochrane was the daughter of John Campbell Cochrane, 4th Earl of Dundonald and Lady Anne Murray.
She married Alexander Stewart, 6th Earl of Galloway, son of James Stewart, 5th Earl of Galloway and Lady Catherine Montgomerie, in 1729.
The Earl (6th) married, as his second wife, 5 January 1728-29, Catherine, third youngest daughter of John Cochrane, fourth Earl of Dundonald. The Countess of Galloway and her sisters, Anne, Duchess of Hamilton, and Susan, Countess of Strathmore, were celebrated beauties of their day. She died at Bath on 15 March 1786. Her will was proved at Edinburgh 1 April 1786.
John Stewart, 7th Earl of Galloway + b. 13 Mar 1736, d. 13 Nov 1806
Admiral Hon. Keith Stewart + b. 1739, d. 5 May 1795
↑ G.E. Cokayne; with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden, editors, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, new ed., 13 volumes in 14 (1910-1959; reprint in 6 volumes, Gloucester, U.K.: Alan Sutton Publishing, 2000), volume VI, page 273.
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It may be possible to confirm family relationships with Catherine by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Catherine: