The younger characters actually get the funniest lines. After Hime-chan (disguised as Emi) makes Kouichi believe she has a fever. She rushes out of the home and Emi sees her leave so she asks her brother who it was; later he asks her. "Did you take your medicine yet?" "... You need to take some instead."
When Hime-chan's dad is trying to get some attention at the family table and they all leave, with just Yumeko (who's about five?) eating across from him. He asks if she'd like to "take a bath with daddy" and she calls him a pervert and walks out.