Dee ihe ọzọ maka paragraf a - Na Nọvemba 1842, McClernand lụrụ Sarah Dunlap nke Jacksonville, Illinois, ezigbo enyi Mary Todd Lincoln. Sarah bụ nwa nwanyị James Dunlap, onye jere ozi dị ka onye na-elekọta ndị agha na Union Army n'oge Agha Obodo, emesịa họpụta ya ka ọ bụrụ onye isi ndị agha. Nwa John na Sarah, Edward John McClernand, bụ onye a ma ama dị ka brigadier general nke United States Army na Agha Ndị India na mgbe e mesịrị na Philippines
Ọ dị mma. Mgbe Sarah nwụsịrị, McClernand lụrụ nwanne ya nwanyị, Minerva Dunlap.