Family Guy: Season 4, Episode 22

Sibling Rivalry (26 Mar. 2006)

TV Episode  -   -  Animation | Comedy
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Ratings: 7.6/10 from 566 users  
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Peter is set to have a vasectomy against his will, but has an accident at the sperm bank, which causes Stewie's rival sibling to be born. Meanwhile, Lois gains weight after an angry Peter refuses to have sex with her anymore.


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Episode cast overview, first billed only:
Lois Griffin / Gym Teacher (voice)
Chris Griffin (voice)
Meg Griffin (voice)
Barbershop Quartet Singer #4 (voice)
Letter a (voice)
Cleveland Brown (voice)
Bob Joyce ...
Barbershop Quartet Singer #1 (voice)
Jon Joyce ...
Barbershop Quartet Singer #2 (voice)
Morgan Freeman (voice)
Rick Logan ...
Barbershop Quartet Singer #3 (voice)
Bertram (voice)
Chris Sheridan ...
Curls from 'B.C' / Waiter (voice)
Danny Smith ...
B.C. (voice)


Peter is set to have a vasectomy against his will, but has an accident at the sperm bank, which causes Stewie's rival sibling to be born. Meanwhile, Lois gains weight after an angry Peter refuses to have sex with her anymore.

Plot Summary | Add Synopsis


Animation | Comedy



Release Date:

26 March 2006 (USA)  »

Company Credits

Show detailed on  »

Technical Specs

Aspect Ratio:

1.33 : 1
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Did You Know?


When Peter mentions his kids, along with the Nick at Nite line-up. He does not mention Meg, which is a running gag on the show. Her name is mentioned in the musical number shortly after. See more »


When showing Lee Harvey Oswald waving to JFK and then later attempting to shoot at the "assassin" on the Grassy Knoll, Oswald is shown directing all of his actions to his left. In reality, both JFK and the Grass Knoll were on Oswald's right from his window spot in the School Book Depository. See more »


Lois Griffin: Chris did you get your homework done?
Chris Griffin: Yep.
Lois Griffin: Chris, I know when you're lying to me, just like Santa Claus knows when you're sleeping.
[short scene with Santa Claus]
Chris Griffin: No mom, I've got it all done. For my science homework I had to make a shoebox diarrhea of the evolution of man.
Lois Griffin: You mean diorama.
Chris Griffin: Ooo-oooohh.
See more »


Spoofs The Sopranos (1999) See more »

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User Reviews

Peter gets a vasectomy to prevent Lois from having any more children. Before doing so he donates to a sperm bank (the result being the birth of Stewies arch rival, Gertrum).
27 March 2006 | by (United States) – See all my reviews

Easily the funniest episode since the new seasons began (post-season 3). The first 15 minutes will have you laughing non-stop. By far, the funniest part is when Stewie and Brian find "diversity" in an A & F catalog by pointing out a miniature-sized Black Waldo among 20 white ripped, shirtless, gel-haired guys. The best quote has to be when Lois complains that Peter is fat as well (she gets fat in the episode) and Peter responds, "Lois, men aren't fat, only fat women are fat." Another funny part is when Stewie talks of a plan of invaiding Gertrum's side of the playground with his "army" of other babies and then Gertrum submits a note to him admitting surrender. Stewie then talks of it being good thing b/c he didn't have an "exit strategy." Afterwards he finds out the note is laced with measles and complains to Gertrum about their deal not to use chemical warfare: absolutely hilarious. The episode also shows Peter in a prison yard forced to "entertain" the prisoners. They make him sing that crappy milkshake song with his shirt off and pants incredibly funny. This may indeed be the funniest episode of Family Guy; i wish Seth McFarlane and the other writers would write every new episode this well.

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