I've just had a very sweet conversation with my youngest:
Amaia: When's Catriona coming to play?
Amaia: Is their whole family coming?
Me: No, just Amanda and the three children.
Amaia: Ahhh - they've got three kids too.
Me: We have five kids, not three kids in our family!
Amaia: No we don't! We have four adults and three kids!