"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9BL-VX1 : accessed 30 July 2017), Leo Petre in household of Tousan Petre, Gilford township, Tuscola, Michigan, United States; citing enumeration district (ED) 117, sheet 4A, family 78, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,744.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLRT-CMJ : accessed 30 July 2017), Leo J Petre in household of Tusan Petre, Jonesfield, Saginaw, Michigan, United States; citing enumeration district (ED) ED 42, sheet 8B, family 32, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 671; FHL microfilm 1,374,684.
"Montana, County Marriages, 1865-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:F3QJ-F9W : 7 December 2014), Leo J. Petre and Bessie Snyder, 04 Aug 1913; citing Marriage, Billings, Yellowstone, Montana, county courthouses, Montana; FHL microfilm 1,943,756.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8QN-R5Q : 12 December 2014), Leo Petre, 1917-1918; citing Madison County, Montana, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,711,435.
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VPFD-XVF : 26 November 2014), Leo Julius Petre, 25 Oct 1948; Department of Public Health Services, Sacramento.
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DNA Connections
It may be possible to confirm family relationships with Leo 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 some percentage of DNA with Leo: