I have the following information:
John Campbell Greenway was born 18 Aug 1795 in Washington Co., Va.He died 12 Jan 1860 and was buried in Abingdon.
John married Margaret Christian Cowan, dau of James Cowan and Margaret Christian Russell (Peggy) on 18 Sep 1821 in Knoxville, Tn.Margaret was born 15 Oct 1799 in Knoxville and died 13 Oct 1882 in Abingdon, where she is buried.
John C. Greenway and Margaret Christian Cowan had the following children:
+1.Margaret Jane Greenway, b 3 Jul 1822, d 28 May 1900
2.James Cowan Greenway, b 13 Jun 1824, Abingdon; d 30 Apr 1891, Washington Co., Va.He married Nannie Byrd Trigg, dau of Dr. Daniel Trigg and Anna Munford Tompkins on 17 Jan 1855.Nannie was b 24 Dec 1838 in Abingdon and d 24 Jan 1895.
+3.Catherine Ann Greenway, b 13 Jun 1826, d 2 Jan 1911.
4.John Humes Greenway, b 23 Aug 1828, Abingdon; d 24 Jun 1855, Abingdon.
5.Edward McDonald Greenway, b 5 Nov 1830; d 24 Jul 1846.
6.William Thomas Greenway, b 14 Jan 1833; d 27 Apr 1867.
7.David C. Greenway, b 13 Dec 1834; d 18 Nov 1886.
8.Mary Virginia Greenway, b 18 Dec 1836; d 30 Apr 1839.
9.Andrew R. Greenway, b 1 Mar 1839; d 5 Jan 1864.
+10. Dr. Gilbert C. Greenway, b 21 Apr 1841; d 19 Jan 1912.
1.Margaret Jane Greenway (John Campbell), b 3 Jul 1822; d 28 May 1900, buried in Washington Co., Va.
Margaret married William Young Conn White, son of Col. James White and Elizabeth Wilson on 18 May 1839 in Abingdon.William was b 1 Jul 1812; d 6 Feb 1882, buried in Washington Co., Va.
Margaret Jane Greenway and William Y.C. White had the following children:
a.Margaret C. White, b 24 May 1840; d 12 Jul 1914.
b.James Lowry White, b 29 Aug 1842, Abingdon; d 9 Dec 1922.James married Catherine Markham Robertson (Kate) on 29 Oct 1867.Catherine was b 20 Feb 1845; d 23 Jul 1922.
c.John Greenway White, b 24 Jan 1845, Abingdon; d 6 Sep 1906.John married Mary J. S. Preston, dau of Dr. Alexander R. Preston and Sarah T. Smith on 12 Oct 1869.Mary was b 7 Jan 1845 in Abingdon; d 7 Feb 1897.
d.Thomas Wilson White was b abt 1847.Thomas married Eliza Armstrong Gibson, dau of James King Gibson and Mary Jane Gibson on 7 Feb 1872.Eliza was b 18 Oct 1849; d 23 Apr 1901.
e.Newton White was b 19 May 1849; d 10 Aug 1898.
f.Elizabeth Wilson White (Bettie) was b abt 1851, Abingdon; d 1922.Elizabeth married Thomas Preston Trigg, son of Dr. Daniel Trigg and Anna Munford Tomkins on 11 Dec 1879 in Abingdon.He died 1922.
3.Catherine Ann Greenway (John Campbell) was b 13 Jun 1826; d 2 Jan 1911.
Catherine married James Wilson Preston, son of John Montgomery Preston and Eleanor Wilson on 3 Oct 1847 in Abingdon.James was b 24 Aug 1821, Abingdon.He d 8 Dec 1881 in Abingdon.
Catherine Ann Greenway and James Wilson Preston had the following children:
a.Ellen Wilson Preston, b 27 Jul 1848, Abingdon; d 19 Jan 1927.
b.Walter Greenway Preston, b 12 Dec 1850, Abingdon; d 11 Feb 1912, Abingdon.
c.Margaret Virginia Preston, b 24 Jun 1854, Abingdon; d 29 Apr 1948.
d.Edward McDonald Preston, b 1856, Abingdon.
e.John Greenway Preston, b 15 Sep 1858, Abingdon; d 1 Jul 1942.
f.Katherine Greenway Preston (Kate) b 1 Jun 1860, Abingdon; d 24 Jun 1942.Katherine married John James Stuart, son of William Alexander Stuart and Mary Taylor Carter on 31 Jan 1889.John was b 15 Apr 1860 in Saltville, Washington Co., Va.; d 13 Jul 1939, Abingdon.
g.Nannie Gilbert Preston, b 31 Mar 1867, Abingdon.
10. Dr. Gilbert Chrisian Greenway (John Campbell) b 21 Apr 1841, Abingdon; d 19 Jan 1912, Hot Springs, Arkansas.
Gilbert married Alice White, dau of Addison White and Sarah Irvine on 15 Jun 1870 in Huntsville, Madison Co., Alabama.
Gilbert Christian Greenway and Alice White had the following children:
a.Addison W. Greenway
b.John Campbell Greenway, b 6 Jul 1872, Huntsville, Madison, Al; d 19 Jan 1926 in NY, NY.He was buried near Burlington, Boone Co., Ky.John married Isabella Dinsmore Selmes (Mrs. Ferguson), dau of Tilden R. Selmes and Martha Macomb Flandran on 4 Nov 1923.Isabella was b 22 Mar 1886 in Boone Co., Ky.She d 18 Dec 1953; buried near Burlington, Boone Co., Ky.
c.Gilbert Christian Greenway.
d.James Cowan Greenway, b 28 Jan 1877, Huntsville, Madison, Al.James married Harriet Lauder on 29 May 1902.
e.Sarah Greenway.Sarah married Col. W. L. Keller.
f.William Irvine Greenway, b 5 Feb 1881, Hot Springs, Ark; d 1928.He was buried in Greenwich, Ct.
Long way of saying, yes, James C. Greenway had a brother named G. C. Greenway. Hope this information helps!