"Ontario, Canada, Marriages, 1826-1936," database and images, Ancestry, (www.ancestry.com: accessed 7 April 2018), Marriage of Donald Duncan Lethbridge to Bessie Irene Cushing, 5 July 1916, London, Middlesex, Ontario, "Registrations of Marriages, 1869-1928," Archives of Ontario; Toronto, Ontario, Canada.
"1921 Census of Canada," database and images, Ancestry, (www.ancestry.com: accessed 7 April 2018), Donald Lethbridge, Ward 1, London, Ontario, "Sixth Census of Canada, 1921," Reference Number: RG 31; Folder Number: 70; Page Number: 8; Library and Archives Canada; Ottawa, Ontario, Canada.
"1930 United States Federal Census," database and images, Ancestry, (www.ancestry.com: accessed 7 April 2018), Donald D Lethbridge, Flint, Genesee, Michigan, "Fifteenth Census of the United States, 1930," Page: 20B; Enumeration District: 0027; National Archives and Records Administration; Washington, D.C.
It may be possible to confirm family relationships with Donald by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Donald: