Jan van Foreest was born 4 October 1586 in Alkmaar, North Holland, Netherlands to Jacob van Foreest (1556-1624) and Maria van Egmond van de Nijenburg (1558-1632) and died 27 October 1651 Hoorn, North Holland, Netherlands of unspecified causes. He married Josina van Segwaert (1585-1657) 4 October 1607 in Dordrecht, South Holland, Netherlands.
Children
| Name | Birth | Death | Joined with |
| Dirk van Foreest (1614-1679) | 1614 Hoorn, North Holland, Netherlands | 1679 Hoorn, North Holland, Netherlands | Hester van Foreest (1615-1705) |