He married Maria Gesina Hoezen am 30 Dec 1871 in Alfhausen, Niedersachsen, Deutschland 

 II-1Theodorus Vennedunker, Born 21 Mar 1869

 II-2Helena Vennedunker, Born 30 Mar 1872, Died 06 Oct 1873

 II-3Helena Vennedunker, Born 24 May 1874, Died 06 Dec 1934

 II-4Bernhard Vennedunker, Born 30 Jun 1877, Died 15 Jun 1934

 II-5Lisabeth Vennedunker, Born 21 Feb 1880

 II-6Gezina Vennedunker, Born 25 Jun 1883

 II-7Johann Vennedunker, Born 06 Jul 1886, Died 11 Aug 1888

 II-8Johann Theodoor Vennedunker, Born 26 Apr 1889, Died 16 Feb 1966

 II-9Anna Margaretha Vennedunker, Born 13 Nov 1891, Died 1967

 II-10Maria Catharina Vennedunker, Born 22 Mar 1895, Died 13 Feb 1941