William Olsen graduated from college in 1910 and became a teacher.His father was Peter Carl Olsen, Born in Sholland, Denmark, 12 June 1854.
Sources
Dansk geologicisk Institut, North Volgade 80, 1358 Copenhagen, Denmark; Herstadvester church records, Sholland, Denmark, Naturalization papers, 1890.
"Iowa Marriages, 1809-1992," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XJ1N-GD1 : 3 December 2014), Peter Olson in entry for William Olson and Nellie Baker, 06 Jun 1906; citing Des Moines, Iowa, reference 2:3Z32N8R; FHL microfilm 1,014,489.
"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XVVC-W2X : 20 May 2016), Wm August Olsen in entry for Wm Carl Olsen, 23 Dec 1909; citing Des Moines, Iowa, United States; county district courts, Iowa; FHL microfilm 1,749,705.
"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VJPV-FL6 : 20 May 2016), William Olson in entry for Nellie Beatrice Olson, 08 Jul 1911; citing Des Moines, Iowa, United States; county district courts, Iowa; FHL microfilm 1,749,705.
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DNA Connections
It may be possible to confirm family relationships with Wilhelm 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 Wilhelm: