| Jakob Jakobs Werkman (1813 - ) |
Berend Harkema |
| Stijntje Pieters Cleverenga (1810 - ) |
Maiske Folkers |
| Pieter Werkman | Sara Harkema |
| b. 11 Jan 1852, Stitswerd d. bur. occ. edu. rel. |
b. 17 Oct 1850, Groningen d. bur. occ. edu. rel. |
| Spouses: 1, 2 |