4x11 Family Remains

Since the previous episode, Sam and Dean have been hunting non-stop at Dean's insistence. This episode has them investigate a murderous young female spirit inside the walls of a suspected haunted house in Stratton, Nebraska. Complications ensue when a family of five moves in, and the "spirit" turns out to be two humans, a young pair of sibling feral children who are the product of incest and years of abuse and who are willing to kill to protect their home. The brothers fail to get the family to leave, but when the son is kidnapped through the walls, they look to Sam and Dean to rescue the boy. Dean manages to rescue the son, but is forced to shoot the feral brother dead in self-defense while the father of the family is forced to stab the girl to death to protect his wife and daughter. In the ending, Dean reflects on the children with pity, sympathizing with them on what they had become after a lifetime of abuse because of how he himself had tortured souls in Hell after being tortured to the breaking point. He believes that he is even worse than the feral children because they hadn't understood what they were doing and took no pleasure in it, whereas he had in Hell, having relished the opportunity to inflict pain on others after having endured so much himself.