Sibling Rivalry (Family Guy)

After a pregnancy scare, Peter reluctantly agrees to get a vasectomy to prevent further repeats. But in the case he and Lois end up wanting to have another baby, Peter donates sperm before his surgery. While in the sperm bank, Peter accidentally destroys all the existing samples, and decides to replace them with his own to prevent himself from getting into trouble. Nine months later, a lesbian couple, who took away some of Peter's sperm in order to conceive a child, gives birth to Bertram, Stewie's half-brother who first appeared in the episode "Emission Impossible".

Shortly after birth, Bertram declares war with Stewie for control over the playground. They confront each other in the playground with F-117 Nighthawks and AH-1 Cobras, firing numerous bullets at each other. After the air battle ends with no winners, Bertram resorts to biological warfare, and uses Stewie's new-found girlfriend to infect Stewie with chickenpox. After recovering, an enraged Stewie confronts Bertram, and they engage in a sword fight in the play area. Stewie eventually wins by disarming Bertram, and later that night, is seen suspiciously digging a hole with Christopher Moltisanti, but the hole is actually for a young tree. When Christopher questions Stewie on what happened to Bertram, Stewie claims that Bertram admitted defeat to Stewie and ran away, with Christopher calling Bertram a mook.

After the vasectomy, Peter loses his sex drive, much to the frustration of Lois, who embraces overeating as a substitute. As a result, she gains some weight and develops a curvy-pear figure. After Peter makes fun of her slight weight gain, she decides to gorge herself so she can deliberately gain more weight out of spite. Her increased appetite results in her going from being curvy to becoming even fatter than Peter is, which ironically ends up reviving their sex life; after accidentally being crushed by a massive Lois in bed, Peter realizes that he finds her new enormous figure much sexier than her old slim one. A new "fat sex" life arises, where Peter embraces Lois' appetite by feeding her mountains of high calorie food to help her grow even fatter. Lois enjoys being fattened up, as the sex continues to get better as she grows bigger. Sadly, the fat sex life is not meant to last, as Lois' enjoyment being force fed causes her weight gain to spiral out of control; she eventually gains so much body fat that her heart finally gives out during sex. She is rushed to the hospital, where she reluctantly agrees to let the doctors remove all of the excess fat from her body, returning her to her normal size. Though she admits that she will miss being huge, she realizes that she should not eat to solve her problems.

Dan Povenmire directed the episode.

The song performed after Lois' pregnancy test comes back negative was written by Alec Sulkin and Alex Borstein, and sung by professional Hollywood studio singers.[3] Orchestrations in this song were performed by Walter Murphy, and described by show producer Seth MacFarlane to be "wonderful".[3] The sketch of Peter challenging Lois to a race to Boston was removed from television broadcasting in order to save time.[4] As Lois is slowly racing Peter to Boston, a Shania Twain song can be heard on the radio; Dan Povenmire states on the DVD commentary that he often gets into trouble for adding pieces of music into an episode when they're so short, yet cost so much.[5] The producers of both Family Guy and the Ice Age series agreed to collaborate in the episode during its reference to Scrat from the Ice Age series.[3]

There was discussion among the producers of the series regarding whether Bertram should be included in the storyline, as he had not appeared in any episodes for several years.[4] An un-used scene was intended for broadcasting which showed Stewie, while trying to find Waldo in an Abercrombie & Fitch catalog, saying to Brian "Oh, turn to the next page. I bet they put him in someone's utility pocket", but it was never used as it was not deemed funny enough for the episode.[3] Originally, Peter singing "Milkshake" to inmates at a prison was going to be naked and push his nipples from underneath, but broadcasting standards objected; as a result, the show broadcast Peter wearing underpants and pushing his nipples from the side.[3][5] When Peter and Lois are in the restaurant and Peter leaves to "warn the chef of Lois' arrival", Lois was intended to say "If he won't put something in me, I will", but the gag was never broadcast.[5]

The unsafe homeless man with whom Peter was seen leaving a youth-baseball team in Stewie's flashback was originally based on John Wayne Gacy, but people claimed he didn't look scary enough, so Povenmire changed the character completely to that of a homeless man.[5] The idea of Stewie and Bertram laughing as they go down the slide during their sword fight was pitched by Povenmire's wife and, although negative about the idea at first, Povenmire included it in the episode because the original sketch was not going so well.[5] During Peter and Lois' "fat sex", Peter repeatedly states "almost, almost"; originally, there was going to be approximately twice as many of these, but they were never included in the episode.[3] The DVD version of the episode shows Peter arriving at the sperm bank and saying to the receptionist: "I have an appointment to banish a White Russian from my Kremlin", to which she replies with "This is a sperm bank, you don't have to use innuendo", and Peter concludes the conversation with "Where do I splooge?".[3][5]

In addition to the regular cast, actors Randy Crenshaw, Gavin Dunne, Bob Joyce, John Joyce, Rick Logan, and Wallace Shawn, and voice actors Phil LaMarr, Tara Strong, Nicole Sullivan, and Wally Wingert guest starred in the episode. Recurring voice actor Ralph Garman, and writers Mike Henry, Chris Sheridan, Danny Smith, Alec Sulkin, and John Viener made minor appearances. Actor Patrick Warburton appeared in the episode as well.

When in the children's park, Stewie quotes "Did ya get me my Cheez Whiz, boy" and a man throws one to him, this is a reference to The Blues Brothers.[3] Stewie and Brian attempting to find diversity in an Abercrombie and Fitch catalogue is a reference to the children's book series Where's Wally?,[5] as well as to a lawsuit alleging a lack of diversity in Abercrombie and Fitch's hiring practices. Before the battle between Stewie and Bertram, Stewie says "On my signal, unleash hell." This is a reference to the opening scene of Gladiator. An Ice Age reference is made when Scrat, a character from the films, attempts to steal Peter's nuts.[3] When Stewie invades Bertram's camp at the end of the episode Bertram quotes Star Wars Episode IV: A New Hope, repeating the line Darth Vader says when he senses Obi-Wan Kenobi on the Death Star. When Peter names his kids, Peter mentions the kids from various shows that are currently airing at Nick at Nite. When Brian mentions this, Peter begins naming Street Fighter characters. Brian again points out this fact, after which Peter names various colors.[6] Sauron, the villain from The Lord of the Rings is shown as the Eye of Sauron in a scene where he is trying to find his lost contact lens. A cutaway scene features Peter in a jail surrounded by inmates who force him to strip, squeeze his boobs together, and sing the chorus from Kelis's 2003 hit “Milkshake.” This is possibly an homage to the scene after the credits in the movie Dodgeball: A True Underdog Story in which Ben Stiller does the same thing in his fatsuit.

After Bertram's defeat, the scene cuts away to Stewie and Christopher Moltisanti from The Sopranos digging a hole. The viewer is led to assume that the hole is for Bertram but really it is for a tree Stewie and Christopher are planting. Then Stewie states that Bertram admitted to defeat and ran off after which Christopher calls Bertram a "mook."

"Sibling Rivalry" was watched by 7.95 million viewers, making it the 77th most-watched program of the week.[7] In a review of the episode, Bob Sassone of TV Squad noted "If there's one reason I'm glad I watched tonight's episode it's because I learned exactly how a vasectomy is done," adding that "Peter is going to have a vasectomy, so he decides to freeze his sperm before he does it. This leads to a hysterical, yet truly gross, scene where Peter knocks over an entire shelf of sperm samples, and has to refill them, um, himself."[8] Geoffrey D. Roberts of Real Talk Reviews reviewed the episode negatively, writing "many viewers will probably be disappointed with an episode about sibling rivalry between Stewie and newfound half-brother Bertram. Both share the same goal – to rule the Universe. With Bertram nothing more than a whinier version of his half-brother, it turns out one Stewie Griffin is more than enough."[9]

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