Humour at bedtime

My mom (Nonna) was over last night and was helping to put the kids to bed. She was in Isabella's room getting her ready for bed and I was giving Simon a bottle in his room. From my spot in the rocking chair I hear:

Nonna: "If you're done pooping we have to change your diaper."
Isabella: "I bet it's going to be a REALLY BIG ONE!"
Me: (giggle...feeling sorry for my mom)

After the diaper change, Isabella asked for a fourth book.
Nonna's response: "You're doing this on purpose to delay my departure."
Isabella: "SURE!"