I       Johannes Hendrik (.... - ....) 
  |
  |___II-a  Johannes Adolphus (.... - ....)
           |
           |___III-a  Hendrik Willem (1817 - 1863)
                   |
                   |___IV-a  Geerlof (1844 - ....)
                            |
                            |___V-a  Piet (1882 - 1959)
                                     |
                                     |___VI-a  Elizabeth Ava Maria (1914 - ....)
                                     |
                                     |___VI-b  Piet Geerlof (1920 - ....)
                                              |
                                              |___VII-a  Elly
 
  .