Johannes Posthumus 1837–1920 | | |
Willem Johan Antoon Posthumus 1872–1937 | | |
Elisabeth Wilhelmina Posthumus 1876–1876 | | |
Sipke Posthumus 1877–1955 | | |
Johannes Posthumus 1885–1960 | | |
| | Willem Posthumus 1842–1905 Engelina Wichelhausen (Wigchelhausen) 1850–1941 | | |
| | Elisabeth van Asperen 1813–1881 Sipke Posthumus 1805–1845 |