Joan van Foreest was born 5 June 1766 in Hoorn, North Holland, Netherlands to Cornelis van Foreest (1704-1761) and Maria Eva van Akerlaken (1705–1736) and died 29 December 1766 Hoorn, North Holland, Netherlands of unspecified causes. He married Agatha van Foreest (1733-1801) in Hoorn, North Holland, Netherlands.
Children
| Name | Birth | Death | Joined with |
| Maria Eva van Foreest (1753-1820) | |||
| Nanning van Foreest (1757-1813) | |||
| Joan van Foreest (1762-1825) | |||
| Jacob van Foreest (1767-1826) | |||