Welcome Cemetery, Simpson, Vernon Parish, Louisiana, USA 
↑ Find A Grave, database and images (https://www.findagrave.com : accessed 02 December 2018), memorial page for William McKinley “Mac” Lawrence (17 Nov 1900–11 Feb 1978), Find A Grave: Memorial #27798736, citing Welcome Cemetery, Simpson, Vernon Parish, Louisiana, USA ; Maintained by CDee (contributor 46814182) .
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPBX-WJY : accessed 2 December 2018), William Larance in household of Samuel C Tippit, Police Jury Ward 6, Vernon, Louisiana, United States; citing enumeration district (ED) ED 151, sheet 7B, family 111, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 533; FHL microfilm 1,374,546.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MVW4-GVY : accessed 30 August 2017), William M Laurence in household of Samuel Tippit, Police Jury Ward 6, Vernon, Louisiana, United States; citing ED 101, sheet 8A, line 32, family 11, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 632; FHL microfilm 1,820,632.
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It may be possible to confirm family relationships with Mack 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 Mack: