 Unable to accept the reality of her husband being a veteran serial killer, Sally begins blaming her children for the loss of their lives, hoping Arthur returns to "whisk her away".The blame shifting impacts Rebecca significantly, leading to her suicide, which in turn leads to Jonah beating his mother to death in retribution.Blood-splatter indicates that the murderer was someone of Trinity's height, making people believe that Trinity had found killed them when, in reality, Jonah killed his mother standing on the stairs at the same height as his father.