Sheldon married Abigail Nancy Barnard on 10 May 1860. Abigail (daughter of James Barnard and Elizabeth Cooke) was born on 7 Jan 1840 in Cattaraugus,,New York, USA; died on 8 Dec 1917 in Saranac,Ionia,Michigan, USA. [Group Sheet] [Family Chart]

1. Rosalie Elizabeth Curtiss was born on 12 Mar 1861; died on 16 Feb 1953 in Clinton, Michigan, USA; was buried in Rowley Cemetery, Webberville, Ingham, Michigan, USA.
2. Lillian Abigail Curtiss was born on 26 May 1863; died on 27 Nov 1958.
3. Arthur Warren Curtiss was born on 6 May 1867 in Ionia,Ionia,Michigan, USA; died on 20 May 1932 in Flint,Genesee,Michigan, USA; was buried in Saranac Cemetery,Saranac,Ionia,Michigan, USA.
4. Mary Adell Curtiss was born on 24 Jun 1869; died on 25 Mar 1966.
5. Gilbert James Curtiss was born on 11 Dec 1870; died on 8 Jan 1960; was buried in Saranac Cemetery,Saranac,Ionia,Michigan, USA.
6. Edith Gertrude Curtiss was born on 17 Sep 1873; died on 19 Jun 1964.
7. Twin Curtiss was born about 1875; died about 1875.
8. Twin Curtiss was born about 1875; died about 1875.
9. Evelyn Grace Curtiss was born on 10 Oct 1877; died on 6 Mar 1971; was buried in Saranac Cemetery,Saranac,Ionia,Michigan, USA.