Wanna Trade?

I am not sure if it is a twin thing or a Tate and Emmy thing, but they love to trade things. One will be playing with a toy or book and the other will go and find something the other one likes and work a trade. They have their own language for trading and it always sounds the same. I cannot understand it, but they get what each other is saying. If they think it is a fair trade they will trade the objects, if not they will reject the trade. Sometimes this ends up in a fight, but they try to resolve it with fair trading. It is hard to capture this on camera, but here they are trying to trade the book and the cover.

Emmy has the cover and Tate has the book.

Emmy offers to trade the cover for the book.

Tate does not like the offer....so.....

they throw the cover to the side and fight over the book.