S04E22Family Guy season 4 episode 22: Sibling Rivalry
Aired 26 March 200624 minRated TV-14
Where to watch Family Guy Season 4 in Australia
Family Guy season 4 is streaming in Australia on Disney+ (subscription, listed for the whole show).
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Availability checked 16 November 2026.
What happens in “Sibling Rivalry”
Peter gets a vasectomy and loses all his sex drive. Lois begins to gain weight, and as a result, Peter's regains his interest in his wife. When Lois' habits get out of control, she has a heart attack. The surgeon must remove Lois' fat to reach her heart, returning her to her normal weight. Meanwhile, Stewie's half-brother Bertram returns to confront him, where they have a war for control over the playground.
Episode summary: TMDB.
Before you watch
- It is episode 22 of 30 of season 4, so watch episodes 1 to 21 first.
- It runs about 24 minutes.
- Directed by Peter Shin, Pete Michels and Dan Povenmire, written by Cherry Chevapravatdumrong.
- TMDB users rate it 6.9 out of 10 (32 votes).
Cast and crew of this episode
- Directors
- Peter ShinPete MichelsDan Povenmire
- Writer
- Cherry Chevapravatdumrong
- Guest stars
- Wallace Shawn as Bertram (voice)Wally Wingert as Principal Sloan (voice)Tara Strong as Little Baby Girl (voice)Nicole Sullivan as Nurse at Sperm Bank (voice)Phil LaMarr as Morgan Freeman (voice)
Credits: TMDB.
More from Family Guy Season 4
Every episode of Season 4Family Guy episode guide
Episode names, air dates, runtimes, stills and ratings: TMDB. Air dates are the first broadcast anywhere; where it streams is our daily Australian check.