Reddit mentions of Ballet Shoes (The Shoe Books)

John Lennon was raised by his aunt and uncle, because they felt his mother wasn't capable of it. One of his younger half-sisters was adopted at birth by a Norwegian couple and he never met her, the other two were brought up by his mother and their dad until she died and they were sent to another aunt. His song "Mother" is about his parents not raising him.

I read a lot of Young Adult books, so here's some:

• Finley and the Foster Brother teenage romance, main character goes into care when her mother is hospitalized. Like most YA romance, you have to like the genre :)
  
• Anne of Green Gables for any kids today who don't know it!
  
• Ballet Shoes is an old UK book about three girls who have been adopted into the same family, and go to ballet school (if old stuff counts, there's quite a lot of British stuff set around world war II, like "The war that saved my life" and "Goodnight Mr Tom")
  
• The Great Gilly Hopkins, now a 2016 movie with a great cast, a 12yo girl who wants out of foster care
  
• Dicey's Song, the 2nd book in a series. In the first book, Dicey (a teenage girl) managed to get herself and her siblings to their grandmother's home after their mother disappears ("Homecoming"). This book is about the experience of settling in. It's part of a whole series, the Tillerman Cycle, that covers people in and around the family for years. Great books. My favorite is The Runner, book 4, but that's nothing to do with foster care.
  
  I haven't read these but heard strong recommendations:
  
  
• Returnable Girl, a 13 year old girl in foster care. This won a bunch of awards, but seems pretty predictable
  
• The Last Chance Texaco, I've seen it recommended as a solid story about a kid in a group home
  
  not quite what you asked for, but a few from the perspective of kids with foster siblings:
  
  
• Kinda Like Brothers, a kids book about a 12 year old boy and his foster siblings.
  
• The trouble with Donovan Croft, a boy and his new foster brother, in England.
  
  And some movies, besides Anne of Green Gables and The Great Gilly Hopkins above
  
  
  
• December Boys is a movie about four boys in a (1950's Australia) group home that I feel like is mostly famous for having Daniel Radcliffe in it.
  
• And here's a list of movies recommended by foster alumni. I had totally forgotten that the kid in Free Willy was in foster care!
  
  edit to add: Far From the Tree, an adopted teenage girl learns about her siblings, one adopted and one not.