William Douglas 
William was born about 1400 in Cavers House, Hawick, Roxburgh, Scotland.1 William's father was Archibald Douglas and his mother was <Unknown>. His paternal grandparents were James Douglas and <Unknown>. He was an only child.General Notes
Burke's does not name William a son of Archibald, but does state that William Douglas is of Cavers and (on another page) that Archibald is the founder of the Douglas/Cavers line, so William is a direct descendant of Archibald. Given the dates, there is not much room for another generation between William and Archibald.
Sources:
Title: Burke's Peerage & Baronetage, 106th Edition, Charles Mosley Editor-in-Chief, 1999
Note: DATE 2000
Details of William's family with <Unknown>
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