My Mum's Going to Explode!

'Oooh! I'm going to be a granny!' she cried. 'You already are a granny, Granny.' I pointed out. 'Oh yes. So I am!' Nicholas' mum is having a baby. It's going to mean some big changes. His mum's getting ENORMOUS and Granny wants to live in the garden! But that's not all, because there's an even bigger shock to come.