"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MCJD-NVN : 22 December 2020), Francois Lingle in household of Joseph Lingle, St. Landry, Louisiana, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
"Louisiana Parish Marriages, 1837-1957," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKJH-B4TQ : 18 February 2021), Francois Singley or Langlet and Marie Elise Ordrine, 28 Jan 1869; citing St. Landry, Louisiana, United States, various parish courthouses, Louisiana; FHL microfilm 870,695.
Find a Grave, database and images (www.findagrave.com/memorial/104971403/francois-langley : accessed 23 July 2021), memorial page for Francois Langley (13 Feb 1845–11 Aug 1899), Find a Grave Memorial ID Find A Grave: Memorial #104971403, citing Langley Cemetery, Acadia Parish, Louisiana, USA ; Maintained by Kathy S. Savoie (contributor 47333179) .
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It may be possible to confirm family relationships with Francois by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA test-takers in his direct paternal line.
Mitochondrial DNA test-takers in the direct maternal line: