Willem Johan Antoon Posthumus 1872–1937 | | |
Elisabeth Wilhelmina Posthumus 1876–1876 | | |
Sipke Posthumus 1877–1955 | | |
Johannes Posthumus 1885–1960 | | |
| | Engelina Wichelhausen (Wigchelhausen) 1850–1941 Willem Posthumus 1842–1905 | | | | Johan Lodewijk Wichelhausen 1824–1871 Otilia Wilhelmina Frederika Antonetta Kessler 1822–1892 | | | | Rudolph Frans Wichelhausen 1789–1873 Engelina van Daalen 1799–1849 Jacoba Henderina Bos 1798– | | | | Engelina Magieffick (Maegofiek) – |
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| | | Johan Antoon (Jean Antoine) Kessler 1776–1856 Frederika Paulina Gertrudis Matthias 1791–1871 | | |
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| | | Sipke Posthumus 1805–1845 Elisabeth van Asperen 1813–1881 |
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