Rev. Arnold was a 6th great-grandson of American Immigrant Peter Callaway. His Callaway Ancestry:

.Peter Callaway = Elizabeth Johnson
..John Callaway = Mary Gould
...Edward Callaway = Elizabeth
....Job Callaway = Mary Carter?
.....Joseph Callaway = Nancy Ragan
......Elizabeth Ragan "Eliza" Callaway = Wylie Maxwell
.......Nancy E. "Nannie" Maxwell = William S. Arnold
........[2] Rev. William Wylie Arnold = [1] Mary Glenn Callaway
....John Callaway = Bethany Arnold
.....Rev. Enoch Callaway = Martha Reeves
......Rev. Abner Reeves Callaway = Sarah Jane Howard
.......[1] Mary Glenn Callaway = [2] William Wylie Arnold

REV. WILLIAM WYLIE ARNOLD was the son of WILLIAM S. ARNOLD and NANCY E. "NANNIE" MAXWELL [she later married on November 5, 1863 Georgia State Legislator William Reeves Callaway (March 2, 1820 - December 17, 1894) of Washington, Wilkes Co., Georgia]. He married his 3rd cousin once removed MARY GLENN CALLAWAY December 16, 1875 in La Grange, Troup Co., GA, daughter of REV. ABNER REEVES CALLAWAY and SARAH JANE HOWARD. She was born March 6, 1855 in Greenville, Camden Co., GA, and died September 22, 1907 in La Grange, Troup. Co., GA.

Children of WILLIAM ARNOLD and MARY CALLAWAY are:
i. ETHEL ARNOLD, b. November 9, 1876, La Grange, Troup Co., GA; d. June 25, 1877, La Grange, Troup Co., GA.
ii. HOWARD CALLAWAY ARNOLD, b. January 16, 1878, La Grange, Troup Co., GA; d. August 6, 1929, Fulton Co., GA; m. (1) MARY SHUTTLES, January 17, 1904; b. 1880, Greenville, Meriwether Co., GA; d. 1908; m. (2) MARTHA HILL, June 19, 1918; b. January 17, 1887, of Coweta Co., GA; d. October 9, 1968, Warm Springs, Meriwether Co., GA.
iii. ABNER REEVES ARNOLD, b. May 18, 1879, La Grange, Troup Co., GA; d. November 17, 1943, Atlanta, Fulton Co., GA; m. ANITA HIGHTOWER, September 19, 1906; b. 1883, Harrisonville, Troup Co., GA; d. 1911.
iv. NANCY MAXWELL ARNOLD, b. May 7, 1881, La Grange, Troup Co., GA; d. January 9, 1917, Richland, Stewart Co., GA; m. WILLIAM J. DOWD, May 25, 1905; b. Abt. 1874; d. Richland, Stewart Co., GA.
v. SARAH ARNOLD, b. April 7, 1883, La Grange, Troup Co., GA; d. February 23, 1963, Dougherty Co., GA; m. (1) IDUS C. DOE, October 30, 1901; b. Abt. 1878, Griffin, Spalding Co., GA; m. (2) WILLIAM HENRY BRITTAIN, October 15, 1925; b. March 25, 1870, Cartersville, Bartow Co., GA; d. July 11, 1936, La Grange, Troup Co., GA.
vi. MARY GLENN ARNOLD, b. December 13, 1884, La Grange, Troup Co., GA; m. HERMAN A. LOOPER, April 14, 1913; b. 1882, Georgia; d. of Savannah, Chatham Co., GA.
vii. WILLIAM WYLIE ARNOLD, JR., b. November 26, 1886, Chipley, Harris Co., GA; d. December 10, 1942, Manchester, Meriwether Co., GA; m. ROSALIND WITHERSPOON, January 28, 1914; b. Manchester, Meriwether Co., GA.
viii. EUNICE ARNOLD, b. February 19, 1889, Chipley, Harris Co., GA; d. October 14, 1932; m. WILLARD JAKE GILES, December 26, 1912.
ix. EMMA POPE ARNOLD, b. October 31, 1890, Chipley, Harris Co., GA; d. October 28, 1960, Albany, Dougherty Co., GA.
x. IDA LOUISE ARNOLD, b. March 25, 1894, Richland, Stewart Co., GA; d. February 14, 1975, Islip, Suffolk Co., Long Island, NY; m. DOZIER NELSON FIELDS, October 31, 1922, McDonough, Henry Co., GA; b. April 27, 1896, Mississippi; d. April 14, 1975, New York City, New York Co., NY.