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>Any information on which family line Q. Eliz. II gets this descent? Is it the from the Hanoverians, Stuarts, one of the germanic Princesses that married into the English family, or from her mother's side which is mostly Scots?
I also used to think that the late Queen Elizabeth the Queen Mother (née Elizabeth Bowes-Lyon) was 'mostly Scots', but apparently she is not. Through genealogical research, it has been shown that only one of the surnames of Queen Elizabeth the Queen Mother's 32 great-great-great-grandparents was Scottish. The rest of the surnames of this generation were English (with one surname being Anglo-Irish).
If you'd like to read more about this subject, see the article "Queen Elizabeth's American Ancestry and Cousinship to George Washington and Robert E. Lee", by Anthony R. Wagner in *The Genealogists' Magazine*, Vol. VIII, September 1939, No. 7, p. 370, in which Wagner discusses not only Queen Elizabeth the Queen Mother's American ancestry, but also the fact that "for the last seven generations [...] since 1662, the Lyons have in every generation married Englishwomen, so that Her Majesty is only about one one-hundred-and-twenty-eighth part Scottish." Further, "through her mother's paternal grandfather, Lord William Cavendish-Bentinck, the Queen [as she was at the time of this article, only becoming known as 'the Queen Mother' in the 1950s] traces descent from several of the most illustrious English noble houses [...]".
Alternatively, you can read about "The Ethnic ancestry of Prince William (b. 1982)" at http://homepages.rootsweb.com/~addams/wills.html