This is a work in progress.....
Sources to consult:
The Spur, Volume 30 Angus Company, 1922 Page 36
"History of the George Washington Bicentennial Celebration: Foreign Participation, Volume 1."
Albert H. Spencer “Genealogy of the Spencer Family.”
Murrey & Blue George Washington's England
"The pedigree and history of the Washington family : derived from Odin, the founder of Scandinavia, B.C. 70, involving a period of eighteen centuries, and including fifty-five generations, down to General George Washington, first president of the United States"
PDF Letter of Hon. Charles Sumner to Jared Sparks on the Tomb of the Washington Family in England