This is a good example of why I dislike the misleading way the word "scion" is used here, where it is used to mean nothing more than that the person appears in Burke's Peerage in the article of that name. She is only distantly related to any Viscounts Thurso, being a third cousin to the 1st Viscount Thurso. She was, however, descended from the 1st Sinclair of Ulbster Baronet, who was himself an agnatic descendant, through an illegitimate line, of the 4th Earl of Caithness.
Just my opinion :)
George Sinclair, of Ulbster, d.31 Aug 1770; m. Hon. Janet Sutherland (d.9 Jun 1795), sister of 17th Earl of Sutherland; George descended from an illegitimate son of Hon. William Sinclair, himself son of 4th Earl of Caithness
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Sir John, of Ulbster (10 May 1754-21 Dec 1835), cr Baronet 1786, with remainder, failing his issue male, to the issue male of his daughters by 1st m.; he m.1st 26 Mar 1776 Sarah Maitland (d.15 May 1785); m.2nd 6 Mar 1788 Hon. Diana Jane Elizabeth Macdonald (28 Sep 1769-22 Apr 1845)
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Rev. William (4 Sep 1804-8 Jul 1878); m.1st 28 Dec 1837 Helen Ellice (d.Oct 1842); m.2nd 15 Apr 1846 Sophia Mary Georgiana Tripp (d.22 Jul 1885)
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Ven. John Stewart (15 May 1853-30 Apr 1919); m.9 Aug 1893 Clara Sophia Birchall (d.16 May 1948)
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Sir John Alexander (29 May 1897-22 Mar 1977); m.6 Jul 1927 Esmé Beatrice Sopwith (d.1983)
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Jean Esme (8 Apr 1929-14 Nov 2022); m.6 May 1961 Christopher Bruce Seagrim