Wilhelmus Jansen
- Born: 14 Feb 1860, Den Haag, , Zuid-Holland, Netherlands
- Marriage (1): Maria Catharina Post on 7 Oct 1885 in Den Haag, , Zuid-Holland, Netherlands
- Marriage (2): Margaretha Elisabeth van der Schild on 5 May 1915 in Amsterdam, , Noord-Holland, Netherlands
 Another name for Wilhelmus was Wilhelmus Reemer.
Wilhelmus married Maria Catharina Post, daughter of Unknown and Helena Post, on 7 Oct 1885 in Den Haag, , Zuid-Holland, Netherlands. (Maria Catharina Post was born in 1864.)
Wilhelmus next married Margaretha Elisabeth van der Schild on 5 May 1915 in Amsterdam, , Noord-Holland, Netherlands. (Margaretha Elisabeth van der Schild was born in 1877-1878 in Gorinchem, , Zuid-Holland, Netherlands.)
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