I wasn't sure if too much information would muddle my question; here's what I have.
Based on a transcription of a Bible record, William Car COX's siblings (all putatively children of Aaron and Elizabeth COX) would have all been born in Bucks County, PA, and are reported to be:
Isaac COX b. 17 Aug 1808 Lacy S. COX b. 1 Apr 1815 Jane COX b. 19 June 1816 Elizabeth COX b. 15 Sep 1820 Anna Maria COX b. 5 Oct 1822 Sarah Ann COX b. 29 Jan 1824 Susan COX b. 15 Feb 1826 Aaron COX, Jr. b. 24 Nov 1827 Timothy COX b. 9 Feb 1829
The following information has been verified through public records searches, census records and family records:
William Car COX m. Rebecca Ann BREWSTER 1842 in Ohio, and they had one surviving child:
Aaron COX, b. 16 May 1843 in Clinton County or Warren County, Ohio.
William Car COX m. Elizabeth RILEY 1849 in Warren County, Ohio.Their children were:
Richard H. COX b. 24 Oct 1852 in Ohio Alfred N. COX b. 18 Aug 1854 in Ohio Mary Emiline "Emma" COX b. 04 Dec 1856 in Ohio William Harrison COX b. 20 Jan 1859 in Ohio Sarah Amanda Cox b. 21 Aug 1861 in Ohio