"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3PX-2C9 : accessed 14 March 2016), William D Aerl in household of Ira Aerl, Justice Precinct 1 (all south of Cotton Belt r.r. & west of Waco/Golinda rd.), McLennan, Texas, United States; citing sheet 12A, family 209, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,656.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M232-XS1 : accessed 14 March 2016), Willie D Aerl in household of Ruby Aerl, Justice Precinct 1, McLennan, Texas, United States; citing enumeration district (ED) ED 76, sheet 20B, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,588.
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DNA Connections
It may be possible to confirm family relationships with William 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 William: