Barber Posch was born 17 January 1737 in Hoogkarspel, North Holland, Netherlands to Jongejan Posch (c1712-1795) and Antje Ham (1714-1746) and died 2 May 1791 Lutjebroek, North Holland, Netherlands of unspecified causes. She married Arien Koomen (1739-1812) 24 February 1760 in Hoogkarspel, North Holland, Netherlands.
Children
| Name | Birth | Death | Joined with |
| Antje Koomen (1766-1849) | |||
| Teunis Koomen (1779-1838) | |||
Siblings
| Name | Birth | Death | Joined with |
| Barber Posch (1737-1791) | 17 January 1737 Hoogkarspel, North Holland, Netherlands | 2 May 1791 Lutjebroek, North Holland, Netherlands | Arien Koomen (1739-1812) |
| Klaas Jongejansz (1738-1738) | |||
| Klaas Jongejansz (1739-1739) | |||
| Aaltje Posch (1741-) | |||
| Jacob Posch (1746-1833) | 17 July 1746 Hoogkarspel, North Holland, Netherlands | 10 February 1833 Hoogkarspel, North Holland, Netherlands | Neeltje Palenstijn (1740-1811) |
| Name | Birth | Death | Joined with |
| Pieter Posch (1774-bef1807) | |||
| Claas Jongejansz (1775-) | |||
| Jacob Jongejansz (1776-) | |||
| Geertje Jongejans (1778-) | |||
| Crelis Jongejansz (1782-) | |||
| Geertje Posch (1782-1810) | |||