Trouble with being a Double

Can you imagine what it is like to be an identical twin and share everything, from the way you look to all of your toys?
Ellie and Shay are identical twins. Ellie does not like to share or be mistaken for her sister. Shay loves being a twin and does not understand why Ellie is so upset. Will Ellie and Shay be able to work things out and learn how to be identical but different?