Cox married Mary Ellen Beacher, daughter of John Jacob Beacher Jr. and Angeline Ocum. (Mary Ellen Beacher was born on 31 Aug 1867 in , Schuylkill, PA,1 died on 20 Apr 1950 in Philadelphia, Philadelphia, PA 2 and was buried on 24 Apr 1950 in Roslyn: Hillside Cemetery, Montgomery, PA, USA 2.)
1 1870 United States Census, Pennsylvania, Schuylkill County, New Castle Township, Series: M593 Roll: 1450 Page: 628.
2 Ancestry.com, Pennsylvania, Death Certificates, 1906-1966 (Original data: Pennsylvania (State). Death certificates, 1906–1966. Series 11.90 (1,905 cartons). Records of the Pennsylvania Department of Health, Record Group 11. Pennsylvania Historical and Museum Commission, Harrisburg, Pennsylvania.), Death Certificate 36542. Mary Ellen Felty. Father John J. Beacher. Mother Agnes Buchanan.