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                     ___________________|
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 ___________________|
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|                   |___________________|
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|--Hermanus Gerardus Mertz 
|
|                                                                                   __________________________
|                                                              ____________________|__________________________
|                                        _Willem Mertz _______|
|                                       |                     |                     _Johannes Hendrick Merts _
|                                       |                     |_Petronella Merts __|_Willemijntje Kooij ______
|                    _Pieter Mertz _____|
|                   |                   |                                           __________________________
|                   |                   |                      _Jan van Beek ______|__________________________
|                   |                   |_Geurtje van Beek ___|
|                   |                                         |                     __________________________
|                   |                                         |_Antje Groenestein _|__________________________
|_Geertruida Mertz _|
                    |                                                               __________________________
                    |                                          ____________________|__________________________
                    |                    _Jan de Rooij _______|
                    |                   |                     |                     __________________________
                    |                   |                     |____________________|__________________________
                    |_Aleida van Rooij _|
                                        |                                           __________________________
                                        |                      ____________________|__________________________
                                        |_Johanna Vierbergen _|
                                                              |                     __________________________
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