Getting the joke

Yesterday you asked me to take you upstairs to brush your teeth/get you in bed. Daddy usually does that, so I was saying “Daddy will do it” and you kept saying “No, I want Mamãe to do it”. Then I started saying “Vovó will do it” or “Vovô will do it” and jokingly said “Gato will do it”. You laughed really hard and kept repeating “Hah, Gato will do it” and laughing, and proceeded to say “Gato will do it, oh my gosh!”. It was hilarious because we could see you really “got it”. You laughed all the way to the bathroom and I added that Gato would brush your teeth, which continued to amuse you.