[s4e22] Sibling — Rivalry

: Stewie encounters his half-brother, Bertram (born from a sperm bank donation Peter made years earlier), at the playground. The two share the same genius-level intellect and megalomaniacal ambitions.

: After undergoing a vasectomy, Peter loses his sex drive, leaving Lois feeling neglected. To cope with her frustration, she begins overeating.

: The episode includes a shot-for-shot parody of the film Better Off Dead during a drag race scene. [S4E22] Sibling Rivalry

: A literal war for "The Hill" at the playground ensues, featuring high-tech weaponry and tactical maneuvers typical of Stewie's sci-fi style.

: Peter finds he is actually attracted to Lois’s new, much larger physique. The two rediscover their spark through what Peter calls "fat sex," and he actively encourages her to continue gaining weight. : Stewie encounters his half-brother, Bertram (born from

The story of follows two chaotic plotlines: one involving Peter and Lois’s marriage and another centered on Stewie’s battle for preschool dominance. The Main Story: Peter and Lois

: Stewie eventually wins the skirmish, successfully reclaiming his territory from his rival sibling. Notable Moments To cope with her frustration, she begins overeating

: One famous gag features the letter "Y" being mocked by other vowels for only being a "semi-vowel". Family Guy S4E22: "Sibling Rivalry" Recap - TV Tropes