Jacob van Foreest was born 17 October 1640 in Hoorn, North Holland, Netherlands to Dirk van Foreest (1614-1679) and Hester van Foreest (1615-1705) and died 3 January 1708 Hoorn, North Holland, Netherlands of unspecified causes. He married Maria Sweers (1649-1720) 15 March 1671 in Hoorn, North Holland, Netherlands.
Children
| Name | Birth | Death | Joined with |
| Dirk van Foreest (1676-1717) | 3 August 1676 Hoorn, North Holland, Netherlands | 7 December 1717 Hoorn, North Holland, Netherlands | Eva Maria de Groot (1677-1706) |
| Nanning van Foreest (1682-1745) | 2 February 1682 Hoorn, North Holland, Netherlands | 15 August 1745 Hoorn, North Holland, Netherlands | Jacoba de Vries (1706-1750) |