Mainly because that's depressing as hell.

Billy taunts the dog by offering a treat for a task physically impossible for dogs. Billy then gets angry at the dog for not completing this task, and pleases himself to take away the treat, and any hope the dog ever had of getting it.

Dolly has yet to realize that grandmother's don't know anything.

Jeffy offers to help his mom, but he's an idiot.

Mother attempts to save time by forcing her son to do her work, but instead wastes possibly more time by watching him do it, because she doesn't even trust her own son.

Billy makes new friends by informing them of his incompetence and rich parents.

Instead of praying for relevant things, Jeffy prays for long-dead cartoon heroes.

Jeffy tries to impress his mom with his obedience in an attempt to seize her cookies.

That doesn't exist, moron.

Jeffy implies that Barfy has contracted an STD from kissing his sister.

Dolly takes advantage of her elderly grandmother.

Billy's lack of vocabulary is humorous.

Once again, Dolly proves her lack of knowledge, this time in the field of snakes.

Revelation, Revelation, 21:8, 21:8, liars go to Hell, liars go to Hell, burn burn burn; burn burn burn.

After an evening playing with his borderline-retarded children, the father devolves back to walking on all fours, and has apparently forgotten where he works.

Dolly proves her lack of knowledge in the field of birds.

Billy attempts to impress his father with made up facts, when in reality it was the greatest winter of Mr. Dumpty's life.

That's because you're poor.

All too quickly, Billy discovers the horrors of life.

Dolly compliments her grandma in skills in preparing scribbled eggs, remarking that she "makes the best". Coincidentally, she's the only one that makes them.

Jeffy's grandma offers terrible advice, resulting in his catching Pneumonia.