Frank married Sarah Elizabeth Harrington on 30 Nov 1892 in Newton, Middlesex, Massachusetts, USA. Sarah (daughter of Henry Clay Harrington and Letitia Campbell Wiswall) was born on 18 Jul 1862 in Newton, Middlesex, Massachusetts, USA; died in 1951 in Pownal, Cumberland, Maine, USA; was buried in Maplewood Cemetery, Pownal, Cumberland, Maine, USA. [Group Sheet] [Family Chart]

1. Letitia Wiswell Mitchell was born on 29 Apr 1896 in Bridgewater, Plymouth, Massachusetts, USA; died in 1964 in Firzwilliam, Cheshire, New Hampshire, USA; was buried in Village Cemetery, Firzwilliam, Cheshire, New Hampshire, USA.
2. Berta S. Mitchell was born on 26 Feb 1907; died on 11 Apr 1991; was buried in Arlington National Cemetery, Arlington, Arlington, Virginia, USA.