| Father | Jan Herlaar (1702 - 1784) |
| Mother | Maria Ariens Streefland (1713 - 1775) |
| Sibling | Anna Harlaar (1747 - 1747) |
| Sibling | Arie Herlaar (1750 - ) |
| Sibling | Adriaan Herlaar (1741 - 1809) |
| Sibling | Jan Harlaar (triplet) (1750 - ) |
| Sibling | Anna Harlaar (1748 - 1822) |
| Sibling | Neeltje Harlaar (1746 - 1823) |
| Sibling | Johannes Harlaar (1744 - 1797) |
| Sibling | Jannigje Harlaar (1742 - 1827) |
| Sibling | Elisabeth Harlaar (1751 - ) |
| Sibling | Pieter Harlaar ( - ) |
| Sibling | Gerrit Harlaar (1739 - ) |
| Sibling | Gerrit Harlaar (1738 - 1738) |
| Sibling | Maria Harlaar or Herlaer ( - ) |
| Sibling | Elisabeth Harlaar (triplet) ( - 1750) |