He married Maria Catharina Gertrud Wübbolding am 22 Jul 1832 in Alfhausen, Niedersachsen, Deutschland 

 II-1Johannes Hermannus Vennedunker, Born 24 Aug 1832, Died 25 Oct 1832

 II-2Maria Catharina Vennedunker, Born 21 Aug 1834, Died 18 Sep 1834

 II-3Anna Maria Theresia Vennedunker, Born 21 Aug 1835, Died 31 Oct 1839

 II-4Maria Wilhelmina Vennedunker, Born 26 Aug 1838, Died 17 Feb 1839

 II-5Maria Elisabeth Theresia Vennedunker, Born 5 Dec 1839, Died 13 May 1842

 II-6Johannes Gerhardus Theodorus Vennedunker, Born 20 Oct 1842, Died 29 Jun 1930

 II-7Hermann Henrich Vennedunker, Born 1 Nov 1845

 II-8Maria Catharina Elisabeth Vennedunker, Born 29 Dec 1849, Died 6 Apr 1860

 

 

 He married Anna Maria Theresia Landwehr am 6 Sep 1882 in Alfhausen, Niedersachsen, Deutschland 

 III-1Johann Hermann Vennedunker, Born 4 Nov 1883, Died 18 Nov 1972

 III-2Maria Elisabeth Vennedunker, Born 2 Jul 1885

 III-3Bernard Joseph Vennedunker, Born 14 Oct 1887

 III-4Johanna Maria Vennedunker, Born 16 Aug 1889, Died 24 Nov 1966

 III-5Maria Agnes Vennedunker, Born 19 May 1891