Saffy's Angel, Indigo's Star, & Permanent Rose all written by Hilary McKay
Saffy's Angel is the first in a trio of stories about the four Casson children. Their mother, Eve, has named all of them (except the second daughter, Saffy) after paint colors. The oldest is Cadmium, then Saffron, Indigo is the only boy, and the youngest is Rose. When their grandfather dies, he leaves something to each child. Saffy is to receive "her angel." Saffy with the help of a new friend, Sarah, takes a trip to Italy to search for her angel. This is a story of belonging and acceptance. Saffy has learned, by accident, why her name is not on the color chart - that she is actually adopted. Her mother, Linda, was Eve's twin sister. Very enchanting and heartwarming, Saffy's Angel is an unforgettable tale.
Indigo's Star continues the story of the Casson family, focusing on the only male child, Indigo. This is a story of bullying at school. Indigo has been ill, and has missed a semester of school as a result. The school bullies eagerly await Indigo's return, so they can renew their attacks on him. There is a new kid at school though, an American who will be in England for one year, Tom. Tom and Indigo become allies. Meanwhile, Indigo's sisters, Caddy, Saffy, and Rose continue to have thier own struggles with life to contend with; Caddy's boyfriends, Saffy and Sarah trying to protect Indigo, and Rose, who is trying very hard not to wear her new "horrible" glasses. This is a hilarious, warm and engaging continuation of the Casson family story.
Permanent Rose is the third in the series of books telling of the four Casson children and their parents, Eve and Bill. The Casson household is, as always, very chaotic. Caddy is now engaged to Michael, but not so sure about it. Saffy, with help from her friend Sarah, is searching for her biological father. Indigo is moving on, building a new friendship after Tom, his friend and ally in the last book, has returned to America. Rose is the focus of this story and Rose has problems. She is determined to find Tom, who has not been in contact with the Cassons since leaving for America. Rose begins shoplifting small items, going off by herself to town, and generally not getting along very well. All is resolved by a sudden trip Rose takes to London. This is a delightful continuation of the Casson family story, and hopefully not the last.
It is probably best to read these three titles by Hilary McKay in order, it is less confusing that way.