Imogen: Mummy, you are going to be the daughter and I am going to be the Mummy.
Me: Okay Mummy.
Imogen: Yes, and now Julius will be the Grandad and Nanny will be the little sister.
Me: Okay, I will try to keep track of that all, kiddo.
Imogen: Not 'kiddo', you have to call me 'Mummy.'
Me: Right. Mummy.
Imogen: And you need to give me the car keys, daughter, because I'm driving now.