Gertrud Schmitz was the daughter of Jakob Schmitz. She was born in Dahl, Rhein-Sieg-Kreis, Nordrhein-Westfalen, Germany.

Theodor and Gertrud were married on December 1, 1670 in Neunkirchen, Rhein-Sieg-Kreis, Nordrhein-Westfalen, Germany and had the following children. The first was born in Höfferhof/Hoff and the rest in Wennerscheid:

Eva (29 Feb 1672 - ) m. 2 Feb 1700, Neunkirchen, Johann Peter Peters
Johann Peter (21 Jan 1674 - Renzert) m. 29 Nov 1690, Neunkirchen, Barbara Renzert
Christine Margaretha (21 Feb 1678 - )
Nikolaus (23 May 1683 - )
Johann Wilhelm (6 May 1685 - )
Eva Margaretha (11 May 1687 - )
Anna Maria (25 May 1690 - ) m. Neunkirchen, Johannes Wilhelm Kaufmann
Anna Gertrud (Jun 1692 - )