Ralph married Viola LeFavour Haszard 24 Jan 1920, Wenham, , Massachusetts, United States. Viola (daughter of Henry William Haszard and Florence Ellen LeFavour) was born 27 Aug 1901, Beverly, Essex, Massachusetts, United States; died 14 Feb 2001, Lexington, , Massachusetts, United States; was buried , North Cemetery, Lunenburg, , Massachusetts, United States. [Group Sheet]

1. Ralph Sargent Foster, Jr was born 23 Aug 1920, Essex, , Massachusetts, United States; died 30 Mar 2006, Leominster, Worcester, Massachusetts, United States; was buried 3 Apr 2006, ? Cemetery, Westminister, Worcester, Massachusetts, United States.
2. Roger Webster Foster was born 30 Mar 1924, Lunenburg, , Massachusetts, United States; died 30 Oct 1997, Leominster, , Massachusetts, United States; was buried 5 Nov 1997, North Cemetery, Lunenburg, , Massachusetts, United States.
3. Robert Nathan Foster was born 24 Jul 1927, Lunenburg, , Massachusetts, United States; died Nov 1979.
4. William Conant Foster