Knut married Hilda Maria Klasson on 20 Sep 1904 in Ingarö Församling, Stockholms Län. Hilda (daughter of Karl Klasson and Johanna Andersdotter) was born on 20 Sep 1879 in Lidköping, Skaraborgs Län; died on 3 Mar 1943. [Group Sheet] [Family Chart]

1. Karin Maria Karlsson was born on 2 Jan 1908 in Vesternäs, Ingarö Församling, Stokcholms Län; was christened on 1 Mar 1908; died on 9 Feb 1978.
2. Anna Lisa Karlsson was born on 17 Nov 1909 in Vesternäs, Ingarö Församling, Stokcholms Län; was christened on 31 Dec 1909; died on 1 Feb 1999.
3. Rut Cecilia Karlsson was born on 17 Nov 1909 in Vesternäs, Ingarö Församling, Stokcholms Län; was christened on 31 Dec 1909; died on 21 Apr 1992.
4. Hilda Ingegerd Karlsson was born on 20 Jan 1915 in Södernäs, Ingarö Församling, Stokcholms Län; was christened on 28 Mar 1915; died on 12 Feb 2002.