A dark look into Clay's youth. He was quite the Christian momma's boy (her precious only ever) but a disturbing secret revealed later, and Clay gets angry at his mom...pulls a prank that ends up killing her because of her Christian paranoias. His dad, who is supposed to be the sane one in the family takes his frustration over his wife's loss by slapping his boy which Clay misinterprets as a means of feeling worth something by his dad. There's lots of funny as these revelations are made and is a great setup to explain Clay's fathering approach towards Orel.
It's a sad but realistic look at reality as we see that the way our parents grew up affect the way they raise their own offspring.