Calvin married Elvira Tamar Bancroft on 3 Mar 1853 in Sutton, Worcester, Massachusetts, USA. Elvira (daughter of Moses Bancroft and Lydia Seaver) was born on 17 Apr 1833 in Phillipston,Worcester,Massachusetts, USA; died in Jun 1914 in El Campo,,Texas, USA; was buried in Schaller Cemetery,Schaller,Sac,Iowa, USA. [Group Sheet] [Family Chart]

1. Everett Ethan Harback
2. Daughter Harback died before 1914.
3. Charles Austin Harback was born on 2 Mar 1854 in Westminster,,Massachusetts, USA; died on 12 Feb 1911 in Clay,Iowa, USA; was buried on 16 Feb 1911 in Riverside Cemetery,Sencer,Clay,Iowa, USA.
4. Lillian Helena Harback was born on 26 Apr 1856 in Iowa, USA; died before 1914.
5. Hattie Etheline Harback was born on 12 Mar 1873.