This specific episode, "Family Cat" (Season 19, Episode 19), is a sharp look at how a new presence can disrupt the established of a home.
On the surface, it’s a classic Family Guy gag about Peter being replaced by a manipulative cat named Puss in Boots. However, underneath the slapstick, it explores some surprisingly deep themes: Family CatFamily Guy : Season 19 Episode 19
It highlights how quickly a person’s role in their own family can be undermined. Peter goes from the "head of the house" to an outsider simply because a more "charming" entity enters the space, proving that belonging is often conditional. This specific episode, "Family Cat" (Season 19, Episode