What’s the order of Hilary McKay’s Casson family books?

Hilary McKay writes many great books. One of her more popular series is about the Casson family known as The Casson Family Books.  With four artsy and eccentric siblings that care a great deal about one another, these are fun books to read. It is difficult however to determine the order of the books; perhaps that implies they can be read out of order.  For those sequential readers, here’s the order of preference: Saffy’s Angel, Indigo Star, Permanent Rose, Caddy Ever After, and Forever Rose.  From the author’s website, there’s even a blog written in the youngest Casson voice, Rose, on Rose’s Blog.