Johann married Maria Elisabetha Kopp on 28 May 1797 in Niederurff, Schwalm-Eder-Kreis, Hessen, Germany. Maria (daughter of Conrad Kopp and Maria Catharina Lueckel) was born on 2 Jul 1774 in Zwesten, Schwalm-Eder-Kreis, Hesse, Germany. [Group Sheet] [Family Chart]

1. Henrich Theis was born on 22 Aug 1799 in Niederurff, Schwalm-Eder-Kreis, Hessen, Germany.
2. Anna Catharina Theis was born on 18 Mar 1801 in Niederurff, Schwalm-Eder-Kreis, Hessen, Germany.
3. Maria Elisabetha Theis was born on 4 Jul 1804 in Niederurff, Schwalm-Eder-Kreis, Hessen, Germany.
4. Johannes Theis was born on 5 Feb 1807 in Niederurff, Schwalm-Eder-Kreis, Hesse, Germany; died on 23 Apr 1853.
5. Anna Gertrude Theis was born on 4 Jul 1809 in Niederurff, Schwalm-Eder-Kreis, Hessen, Germany; died on 5 Nov 1853 in 1 1/2, Großenenglis, Schwalm-Eder-Kreis, Hesse, Germany; was buried on 7 Nov 1853 in Großenenglis, Schwalm-Eder-Kreis, Hesse, Germany.