Theodore married Bertha Mae Kopp on 17 Oct 1936. Bertha (daughter of Pius Kopp and Lina Zimmermann) was born on 13 Apr 1913 in Richardton, Stark County, North Dakota, USA; died on 1 Aug 1949 in San Leandro, Alameda County, California, USA; was buried in Evergreen Cemetery, Oakland, Alameda County, California, USA. [Group Sheet] [Family Chart]

1. Marjorie Neidhardt
2. Marlin Neidhardt

Theodore married Elaine Winnifred Venaas on 27 May 1950 in Dickinson, Stark County, North Dakota, USA. Elaine was born on 16 Oct 1912 in Litchville, Barnes County, North Dakota, USA; died on 4 Nov 2003 in Bismarck, Burleigh County, North Dakota, USA; was buried in Saint John's Cemetery, Hebron, Morton County, North Dakota, USA. [Group Sheet] [Family Chart]

1. Robert Neidhardt
2. Sandra Neidhardt