| | Cornelia Barendina Blanc 1884–1957 Pieter Willem Medema 1883–1962 | | |
| | Catharina Houwing 1851–1923 Jacob Johannes Blanc 1850–1887 | | |
| | Jacob Jacobs Houwing 1824–1884 Martje Gaikes van Polen 1826–1913 | | |
| | Jacob Arends Houwing 1781–1848 Trientje Wilko Hesse 1783–1857 | | |