Exiles — Greg Hunt

While Kansas and Missouri clash in fierce battle over slavery, the Hartmans learn that blood is not thicker than water, They are compelled to choose sides in a battle so overwhelming it threatens to unravel their family ties. Before the war ends, family members will die, others will vow revenge, traitors will reveal themselves--and one Hartman will decide whether to expose a plot which could tip the balance of the war.

There would be no turning back, no reconciliation ever for fiercely righteous frontier clan, as they square off against each other in BORDERLAND 2: THE EXILES