Main
Jan Sijm was born circa 17 July 1739 in Wervershoof, North Holland, Netherlands to Pieter Sijm (1711-1752) and Geertje Jans (1713-1752) and died 21 January 1822 Andijk, North Holland, Netherlands of unspecified causes. He married Antje Knuijsen (1737-1825) 27 January 1761 in Wervershoof, North Holland, Netherlands.
Children
| Name | Birth | Death | Joined with |
| Antje Sijm (1785-1877) | |||
| Jacob Sijm (1775-1840) | 7 March 1775 Andijk, North Holland, Netherlands | 2 November 1840 Andijk, North Holland, Netherlands | Grietje Diggelom (1776-1853) |
| Arien Sijm (1773-1856) | |||
| Jacob Sijm (1772-1797) | |||
| Geertje Sijm (1770-1819) | 30 January 1770 Andijk, North Holland, Netherlands | 21 April 1819 Grootebroek, North Holland, Netherlands | Volkert Reus (1759-1815) |
| Jacob Sijm (1768-1771) | |||
| Jan Sijm (1766-1808) | |||
| Marijtje Sijm (1765-1843) | 1 May 1765 Bangert, Andijk, North Holland, Netherlands | 20 October 1843 Wervershoof, North Holland, Netherlands | Volkert Deen (1761-1812) Pieter Kapitein (1759-1835) |
| Pieter Sijm (1762-1808) | |||
Footnotes (including sources)
| ‡ General |