+--Clement Janssen 
+--Jacobus Janssen  (1802-15 Sep 1848)
|  +--Margaretha Laurense 
Achilles Clement Janssen  (ABT 1829-2 Aug 1879)
|  +--Guilhelmus Vreven 
+--Gertrudis Guillemina Vreven  (11 Mar 1805-30 Nov 1848)
   +--Wilhelmina ten Bosch