^^ 
   Hendricus Maria Johannes Schipper & Clazina Johanna Verhage               
                                |                                            
             ----------------------------------                              
             |                                |                              
 Clazina Elizabeth Schipper     Hendrikus Johannes Schipper &                
     & Arnold W. Sewalt      Apolonia Joanna Maria van der Lubbe             
             |                                |                              
  Ronaldus Petrus Antonius       Petrus Theodorus Schipper &                 
           Sewalt                Jacqueline Françoise Kleiss                 
                                              |                              
                                     Ian Melvin Schipper            Maaike   
                                              |                     Kleijn   
                                              |                        |     
                                              --------------------------
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