Whakaotihia te rerenga e whai ake nei: I te marama o Whiringa-a-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 Hoani raua ko Hara, ko Edward John McClernand, i rongonui hei rangatira rangatira mo te ope taua a te US i nga Pakanga o Inia, a muri ake i te pakanga o te United States.
Ko ngā Piripi. Whai muri i te matenga o Sarah, ka marenatia a McClernand ki tana tuahine, a Minerva Dunlap.