Geertje Jans was born 1713 to Jan Jacobsz and Aacht Cornelis and died 17 February 1752 in Andijk, North Holland, Netherlands of fever. She married Pieter Sijm (1711-1752) 28 January 1739 in Wervershoof, North Holland, Netherlands.
Note that there are three hypotheses for Geertje's parents: Jan Jacobsz & Aacht Cornelis, Jan Jacobsz & Greetje Pieters, Jan Tiet & Immetje Dekker. Nico Sijm claims Pieter is Geertje's first cousin.
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