Sibling Rivalry

Peter gets a vasectomy after a pregnancy scare from Lois, which puts a kibosh on Peter and Lois's sex life and Lois begins overeating and gets fat. Meanwhile, Stewie's sperm brother Bertram is born and fights a battle against Stewie.

Season 4 | Episode 22

TV-14-DLSV
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Cast

Seth MacFarlane

as Peter Griffin

Alex Borstein

as Lois Griffin

Seth MacFarlane

as Stewie Griffin

Mila Kunis

as Meg Griffin

Seth Green

as Chris Griffin

Seth MacFarlane

as Brian Griffin

Seth MacFarlane

as Glenn Quagmire

Patrick Warburton

as Joe Swanson

Mike Henry

as Cleveland Brown