Cornelis Pieters Sijm was born 3 August 1746 in Onderdijk, North Holland, Netherlands to Pieter Sijm (1711-1752) and Geertje Jans (1713-1752) and died 14 February 1809 Blokker, North Holland, Netherlands of unspecified causes. He married Meinouwtje Buurman (1749-1825) 28 January 1777 in Blokker, North Holland, Netherlands.
Children
| Name | Birth | Death | Joined with |
| Jacob Sijm (1787-1840) | 26 April 1787 Blokker, North Holland, Netherlands | 11 April 1840 Blokker, North Holland, Netherlands | Aagje Heering (1796-1854) |
Siblings
| Name | Birth | Death | Joined with |
| Adrianus Sijm (1750-1762) | |||
| Cornelis Sijm (1746-1809) | 3 August 1746 Onderdijk, North Holland, Netherlands | 14 February 1809 Blokker, North Holland, Netherlands | Meinouwtje Buurman (1749-1825) |
| Sijmen Sijm (1744-1804) | 19 April 1744 Onderdijk, North Holland, Netherlands | 5 November 1804 Bangert, Andijk, North Holland, Netherlands | Neeltje Akkerman (c1743-1808) |
| Anna Sijm (1742-?) | |||
| Jan Sijm (1739-1822) | 17 July 1739 Wervershoof, North Holland, Netherlands | 21 January 1822 Andijk, North Holland, Netherlands | Antje Knuijsen (1737-1825) |
Residences
Footnotes (including sources)
| ‡ General |
| Ω Birth |