Knud married Elke Korsemann in 1952. Elke (daughter of Friedrich Fürchtegott Stuck Korsemann and Johanna Luise Schmidt) was born on 12 Apr 1933 in Dalsgaarde, Rinkenæs Sogn, Lundtoft Herred, Åbenrå Amt; was christened on 6 Aug 1933 in i hjemmet/at home; died on 28 May 2021; was buried on 3 Jun 2021 in Sønder Vilstrup Kirkegård, Vilstrup Sogn, Haderslev Herred og Amt. [Group Sheet] [Family Chart]

1. Jørgen Nissen
2. Hermann Nissen
3. Georg Nissen
4. Knud Nissen
5. Olof Nissen