"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDQF-4RD : 12 April 2016), Leon Jellson in household of Lucy Porter, Massachusetts, United States; citing p. 16, family 150, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,156.
"Vermont, St. Albans Canadian Border Crossings, 1895-1954," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QK31-RDCY : 16 March 2018), Leon Jillson, 1895-1924; citing M1461, Soundex Index to Canadian Border Entries through the St. Albans, Vermont, District, 1895-1924, 207, NARA microfilm publications M1461, M1463, M1464, and M1465 (Washington D.C.: National Archives and Records Administration, publication year); FHL microfilm 1,473,007.
"Massachusetts Births and Christenings, 1639-1915," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FC1B-W28 : 10 February 2018), Leon D. Jillson in entry for Harvey D. Jillson, 03 May 1886; citing Fitchburg, Massachusetts, ; FHL microfilm 1,428,239.
Acknowledgements
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DNA Connections
It may be possible to confirm family relationships with Leon by comparing test results with other carriers of his ancestors' Y-chromosome or 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 Leon: