Geertje Jans was born 1713 to Jan Jacobsz and Aacht Cornelis and died 17 February 1752 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.
|Offspring of Geertje Jans and Pieter Sijm (1711-1752)|
|Jan Sijm (1739-1822)||17 July 1739 Wervershoof, North Holland, Netherlands||21 January 1822 Andijk, North Holland, Netherlands||Antje Knuijsen (1737-1825)|
|Anna Sijm (1742-?)|
|Sijmen Sijm (1744-1804)||19 April 1744 Onderdijk, North Holland, Netherlands||5 November 1804 Bangert, Andijk, North Holland, Netherlands||Neeltje Akkerman (c1743-1808)|
|Cornelis Sijm (1746-1809)||3 August 1746 Onderdijk, North Holland, Netherlands||14 February 1809 Blokker, North Holland, Netherlands||Meinouwtje Buurman (1749-1825)|
|Adrianus Sijm (1750-1762)|