Tuhia he tomokanga mō tēnei wāhanga - I te marama o Whiringa-ā-rangi 1842, ka marenatia a McClernand ki a Sarah Dunlap o Jacksonville, Illinois, he hoa tata o Mary Todd Lincoln. Ko Sarah te tamahine a James Dunlap, i mahi hei quartermaster i te Union Army i te Pakanga a-Rohe, i te mutunga ka tohua ki te taumata o te brevet major general. Ko te tama a John raua ko Sarah, ko Edward John McClernand, i rongonui hei rangatira rangatira o te ope taua o Amerika i nga Pakanga Inia, i muri mai i nga Philippines
He aha? Whai muri i te matenga o Sarah, ka marenatia a McClernand ki tana tuahine, a Minerva Dunlap.