William K. Ketchison was born 7 July 1759 in Howden, Yorkshire, England. His parents were William Ketchison (1736-1763) and Sally Ayr. He emigrated in 1775 and settled in Virginia. He fought with the British in the American Revolution. He married Mary Rull (1761-1842) 16 March 1779 in Bedford, New York. They had ten children. They migrated to Canada in 1783 and settled first in Nova Scotia and then moved to Sidney, Ontario. William died in 1848 in Belleville, Ontario. Descendants and relatives lived throughout Ontario.

Previously published by Magna Carta, Baltimore. Published as a set by Genealogical Publishing with the two vols. of the Genealogies in the Library of Congress, and the two vols. of the Supplement. Set ISBN is 0806316691.