Frank married Hildagarde Cooper on 27 May 1920 in Pittsburgh, Allegheny County, Pennsylvania, USA. Hildagarde (daughter of Peter Cooper and Maria Anna Arnold) was born on 24 Mar 1900 in Pittsburgh, Allegheny County, Pennsylvania, USA; died on 2 Jul 1984 in Pittsburgh, Allegheny County, Pennsylvania, USA. [Group Sheet] [Family Chart]

1. Marian Frances Erra was born on 20 Mar 1921 in Pittsburgh, Allegheny County, Pennsylvania, USA; died on 13 May 1997 in Pittsburgh, Allegheny County, Pennsylvania, USA.
2. Charles Thomas Erra was born on 2 Sep 1922 in Pittsburgh, Allegheny County, Pennsylvania, USA; died on 16 May 1996 in Pittsburgh, Allegheny County, Pennsylvania, USA.
3. Loretta Theresa Erra was born on 18 Nov 1927 in Pittsburgh, Allegheny County, Pennsylvania, USA; died on 2 Feb 2003 in Pittsburgh, Allegheny County, Pennsylvania, USA.