Conversation with a three year old

Here's the scene: It's lunchtime, spaghetti is on the menu, Rhys has his cheese on his, Joseph (being Joseph) has his on a plate next to his.

I need to do poose Mummy.
Good boy darling, off you go, call me when you're finished.
Mummy!
Yes?
Is Rhys eating my cheese?!
No darling he is eating a mandarin.
Why?!
Because he's finished his lunch.
Mummy?!
Yes?
Is he eating my cheese?!
No, he is eating his mandarin.
Why?!

Mummy?!
Yes.
I'm sifished.
Good boy.