McGugin was born in July 1879 on a farm near Tingley, Iowa. He was the son of Benjamin Franklin McGugin (1843–1925) and Melissa (Critchfield) McGugin (1845–1915).
McGugin was born in July 1879 on a farm near Tingley, Iowa. He was the son of Benjamin Franklin McGugin (1843–1925) and Melissa (Critchfield) McGugin (1845–1915).