Sijmen Jacobsz Beers was born 21 July 1749 in Onderdijk, North Holland, Netherlands to Jacob Beers (1712-1763) and Grietje Neuvel (1710-1782) and died 26 August 1828 Wervershoof, North Holland, Netherlands of unspecified causes. He married Maartje Stam (-1783) 6 February 1775 in Wervershoof, North Holland, Netherlands.
Children
| Name | Birth | Death | Joined with |
| Jacob Beers (1775-1857) | |||
| Dieuwertje Beers (1778-) | |||
| Grietje Beers (1779-) | |||
| Klaasje Beers (1781-1860) | 22 June 1781 Bangert, Andijk, North Holland, Netherlands | 25 May 1860 Westwoud, North Holland, Netherlands | Jan Swan (1782-1860) |
Siblings
| Name | Birth | Death | Joined with |
| Sijmen Beers (1736-1736) | |||
| Etje Beers (1739-1739) | |||
| Etje Beers (1740-1741) | |||
| Etje Beers (1744-1744) | |||
| Sijmen Beers (1745-1746) | |||
| Sijmen Beers (1747-1747) | |||
| Jan Beers (1748-) | |||
| Simon Beers (1749-1828) | 21 July 1749 Onderdijk, North Holland, Netherlands | 26 August 1828 Wervershoof, North Holland, Netherlands | Maartje Stam (-1783) |
| Jantje Beers (1751-1817) | 2 July 1751 Onderdijk, North Holland, Netherlands | 2 March 1817 Andijk, North Holland, Netherlands | Dirk Meester (1746-1822) |