Mezue ahịrịokwu na-esonụ: Na November 1842, McClernand lụrụ Sarah Dunlap nke Jacksonville, Illinois, bụ́ 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 ama ama dịka onye ọchịagha ndị agha US n'agha ndị India na mgbe e mesịrị na
Filipinz Mgbe Sarah nwụsịrị, McClernand lụrụ nwanne ya nwanyị, Minerva Dunlap.