Isaac married Marzelia Jane Vandergriff in 1891. Marzelia (daughter of John Fletcher Vandergriff and Nancy Ann Brown) was born on 13 Sep 1868 in Sequatchie County, Tennessee; died on 2 Feb 1957 in Hamilton County, Tennessee. [Group Sheet] [Family Chart]

1. Walter Foster Coffelt was born on 1 Jan 1892 in Hamilton County, Tennessee; died on 15 Jan 1969 in Hamilton County, Tennessee.
2. Fletcher Franklin Coffelt was born on 1 Feb 1894 in Sequatchie County, Tennessee; died on 12 Jul 1974 in Hixson, Hamilton County, Tennessee; was buried in Friendship Baptist Church Cemetery, Hixson, Hamilton County, Tennessee.
3. Frederick Melton Coffelt was born on 16 Apr 1896 in Hamilton County, Tennessee; died on 28 Feb 1958 in Hamilton County, Tennessee.
4. Clifford John Coffelt was born on 2 Mar 1899 in Hamilton County, Tennessee.
5. Dr. Bert Bennett Coffelt was born on 24 Jan 1901 in Hamilton County, Tennessee; died on 2 Jul 1973 in Hamilton County, Tennessee.
6. Willie Mae Coffelt was born on 5 Oct 1906 in Hamilton County, Tennessee; died on 4 Apr 1915 in Hixson, Hamilton County, Tennessee; was buried on 5 Apr 1915 in Shadwick Cemetery, Hixson, Hamilton County, Tennessee.
7. Carrie Irene Coffelt was born in in Hamilton County, Tennessee.
8. Paul Willis Coffelt was born on 26 Jul 1910 in Hamilton County, Tennessee; died on 3 Apr 2002 in Soddy-Daisy, Hamilton County, Tennessee.
9. James R. Coffelt