Franz married Elisabetha Mandery on 9 May 1859 in Theresa, Dodge County, Wisconsin, USA. Elisabetha (daughter of Franz Joseph Mandery and Franziska Rosina Wegmann) was born on 26 May 1837 in Völkersweiler, Pfalz, Bayern; was christened on 26 May 1837 in Völkersweiler, Pfalz, Bayern; died on 3 Oct 1905 in Milwaukee County, Wisconsin, USA. [Group Sheet] [Family Chart]

1. Franz Theissen was born in 0Mar 1860 in Theresa, Dodge County, Wisconsin, USA; died in 0Mar 1860 in Theresa, Dodge County, Wisconsin, USA.
2. Reverend Peter Theissen was born on 16 Nov 1863 in Theresa, Dodge County, Wisconsin, USA; died on 23 Oct 1933 in Milwaukee, Milwaukee County, Wisconsin, USA.
3. Barbara Elizabeth Theissen was born on 22 Jun 1865 in Theresa, Dodge County, Wisconsin, USA; died on 7 Nov 1912 in Wisconsin, USA.
4. Francis George Washington Theissen was born on 22 Feb 1869 in Theresa, Dodge County, Wisconsin, USA; died on 29 Jul 1911 in Lomira, Dodge County, Wisconsin, USA; was buried in St. Mary's Cemetery, Lomira, Dodge County, Wisconsin, USA.
5. John B. Theissen was born on 4 Feb 1871 in Theresa, Dodge County, Wisconsin, USA; died on 10 Nov 1924 in Allouez, Brown County, Wisconsin, USA; was buried in Woodlawn Cemetery, Allouez, Brown County, Wisconsin, USA.
6. Dr. Frank M. Theissen was born in 0Oct 1873 in Theresa, Dodge County, Wisconsin, USA; died in 0Apr 1916 in Milwaukee, Milwaukee County, Wisconsin, USA.