Sylvester married Mary Ann Boynton on 9 May 1838 in Paxton, Worcester, Massachusetts, USA. Mary (daughter of David Boynton and Lucy B. Johnson) was born on 3 Mar 1816 in Grafton, Windham, Vermont, USA; died on 18 Apr 1880 in Worcester, Massachusetts, USA. [Group Sheet] [Family Chart]

1. Louisa Adelaide Ellis was born on 1 Jan 1840 in Worcester, Worcester, Massachusetts, USA; died on 21 Dec 1844 in Worcester, Massachusetts, USA.
2. Lydia Ann Ellis was born on 31 Jul 1842 in Worcester, Worcester, Massachusetts, USA; died on 31 Dec 1844 in Worcester, Massachusetts, USA.
3. Horace Adams Ellis was born on 11 Dec 1844 in Worcester, Worcester, Massachusetts, USA; died on 27 Jul 1845 in Worcester, Massachusetts, USA.
4. Osborne A. Ellis was born on 25 Apr 1847 in Worcester, Massachusetts, USA; died on 22 Oct 1847 in Worcester, Worcester, Massachusetts, USA.
5. Jane Amelia Ellis was born on 14 Aug 1848 in Worcester, Worcester, Massachusetts, USA; died on 21 Apr 1922 in Worcester, Worcester, Massachusetts, USA; was buried in Worcester, Worcester, Massachusetts, USA.
6. Angelin Augusta Ellis was born on 15 Jan 1853 in Worcester, Worcester, Massachusetts, USA; died on 30 Aug 1854 in Worcester, Massachusetts, USA.
7. Eva Isabelle Ellis was born on 16 Sep 1856 in Worcester, Massachusetts, USA; died on 23 Jan 1858 in Worcester, Massachusetts, USA.