Here are some other Decker's beside Richard and Sarah:
http://www.interment.net/data/canada/ontario/wentworth/ancast/copetown/index.htm
s/w -stone with
Decker, Carrie, b. 1897, d. 1897, d/o Wm. & Elizabeth Decker, s/w Richard & Sarah Decker
Decker, Christena, b. 1 Jul 1828, d. 3 Oct 1910, w/o Peter Decker, s/w Richard & Sarah Decker
Decker, Elizabeth (Cook), b. 1862, d. 1906, w/o Wm. Decker, s/w Richard & Sarah Decker
Decker, George, b. 1856, d. 22 Jun 1857, aged 1y 3ms, s/o Peter & Christena Decker, s/w Richard & Sarah Decker
Decker, Isaac L., b. 2 Jul 1852, d. 11 Nov 1909, s/w Richard & Sarah Decker
Decker, Margaret Jane, b. 18 Sep 1861, d. 26 May 1914, s/w Richard & Sarah Decker
Decker, Peter, b. 1818, d. 1908, h/o Christena, s/w Richard & Sarah Decker
Decker, Richard, b. 1780, d. 1868, h/o Sarah Mann
Decker, Sarah, b. 1779, d. 1853, w/o Richard Decker, (nee Sarah Mann)
Decker, Wm., b. 1860, d. 1897, h/o Elizabeth Cook, s/w Richard & Sarah Decker
further down
McCormick, Esther (Decker), b. 1850, d. 1868, w/o John McCormick, s/w Richard & Sarah Decker
Hugill, Jane (Decker), b. 1824, d. 1895, w/o John Hugill, s/w Richard & Sarah Decker