Willem was born in 1880 [1]. He is the son of George Jansen and Jannetje Kreijsig. He married Cornelia Sophia Catharina Polder on June 17, 1903 [2]
Sources
↑ "Netherlands Births and Baptisms, 1564-1910," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X1W9-1B5 : 12 December 2014), Georg Hendrik Jansen in entry for Willem Johannes Jansen, 29 Jun 1880; citing Amsterdam, Noord-Holland, Netherlands; FHL microfilm 253,485
↑ "Netherlands, Archival Indexes, Vital Records," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QLM6-WMJ5 : 22 August 2017), Georg Hendrik Jansen in entry for Willem Johannes Jansen and Cornelia Sophia Catharina Polder, Marriage 17 Jun 1903, Amsterdam, Noord-Holland, Netherlands; from database, openarchives (https://www.openarch.nl : 2016); citing Haarlem, inventory number
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DNA Connections
It may be possible to confirm family relationships with Willem 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 Willem: