When Henry is feeling Older Brotherly, he refers to his sister as 'Sweetie.' All other times, she is a shrill, multi-syllabled 'Jaayaayne!' Here is a pre-breakfast conversation from this morning.
Henry: No, Sweetie. We don't eat cookies for breakfast.
Jane: (tilting her head to one side) Why?
Henry: Because it's not a good way to start your day.
Jane: (tilting the other way) Why?
Henry: Because it's not noo-tri-shuss.