Hi Anita Jo, I don't see a fit. Peter & Jane Groce are listed in the 1850 census with the following children: Ambrose(1829), William(1832), John(1835), Catherine(1836), Elijah(1839), Rebecca(1841), Peter(1844), Sylvester(1847), and Sarah(Jan 1850), all born in Winchester. Peter is listed as born in NC, Jane in KY.
I scouted around a bit in NC. Here are some Isaacs that are too early but may be helpful: Isaac Groce & Polly Gough married 17 Oct 1812 (Marriages of Surry County, NC 1779-1868). Isaac was also list in the tax list of 1813, same county.
Would appreciate a fuller reference for "History of Early Pioneers" if you have it so I can order it from my library.
My husband is decended from Ambrose Groce & Martha Beasley, married 9 Dec 1852 in Winchester, Scott, IL. They had 8 children, named John(b.1854), William(1855, Daniel(1857), Emily(1858), Henry(1861), Cathern(1868), Mary(1870), David(1872) all born in Winchester.