+--Theodorus Dreuning  (-31 Aug 1832)
+--Gradus Dreuning  (2 Nov 1819-15 Feb 1891)
|  +--Petronella Valles  (-1 Jan 1846)
Wilhelm Aloijsius Dreuning  (28 May 1849-17 Jun 1926)
|              +--Laurens Jansen  (ABT 1650-16 Dec 1720)
|           +--Cornelis Lauwrensen  (2 Mar 1682-)
|           |  +--Ueltjen van Beijnum  (ABT 1650-21 Aug 1720)
|        +--Johannes Cornelissen   (17 May 1718-)
|        |  |  +--Peter Hendriksen Crijne 
|        |  +--Geertruijt Crijnen  (12 Jun 1687-30 Apr 1762)
|        |     +--Grietje Jansen van Mekelenburgh 
|     +--Jan Johannisse  (-26 May 1818)
|     |  |  +--Jan van Gelder 
|     |  +--Gueldelia Jansen van Gelder 
|  +--Willem Janssen  (13 Jan 1783-17 Jul 1860)
|  |  |  +--Lucas Willemse 
|  |  +--Wanda Lucassen  (-12 Oct 1831)
|  |     +--Anneke Janse 
+--Grada Janssen  (19 Jun 1815-16 Jul 1888)
   |  +--Gerrardus Peters 
   +--Petronella Peters  (7 Mar 1791-12 Sep 1829)
      +--Gerrarda Hermsen