Personification
Easton has taken to personifying things.
For example: The cat in the hat tv show, he says Brian is the cat, I am the fish, Hadley is Sally and he is Nick.
In the book Ten Drowsy Dinosaurs, Hadley is the yellow dinosaur, I am the pink one, Brian is the black one and Easton is the white one with the red boots.
In Bubble Guppies the tv show, I am Gil, Easton is Nonny, Hadley is Oona, Brian is Mr. Grouper. In Super Mario Party 9 for the Wii, Hadley is Daisy, and Easton is Luigi. Easton even closes his eyes and claps like Luigi. He calls himself Wee Gee.
I am sure there is more personification but those are the ones that stand out.