I've heard mixed reviews about the Parr book
I usually love his books! The main issue a lot of people have is that it's kind of a "your parents saved you" book. "You needed a home, we had an extra room. You needed a loving family, and we wanted someone to love." Not direct quotes, but the idea of the book.
We have several adoption books, but none really focus on adoption of a new baby for an older sibling. In our collection:
God Found Us You (A fox mama is sad when she sees all the other animal mamas with their babies, and God finally brings her a baby to love)
Tell Me Again About the Night I was Born (by Jamie Lee Curtis, who adopted her 2 kids--a 4-year-old's retelling of her adoption story--so cute)
Why I Chose You (not really a kids book, but it's a great emotional read! Things like "I chose you because I wanted a reason to swing. I chose you because my heart had a place with your name. I chose you because your hand fit perfectly into mine. I chose you because we both love pb&j."
The Just Right Family (its a Cabbage Patch book about 2 little girls--one struggles through meeting families that aren't right... and then her best friend is adopted, which leaves her feeling alone. But it all ends happily when her best friend's parents love kids so much that they adopt her too)
Why Was I Adopted? (it's gotta be from the 70s! I've had it for as long as I can remember! A long read, but I always went back to it when I needed reassurance.)
--Mimi
Mom to Lala (2004), Bonus Mom to Big Sis 1 (1991) and Big Sis 2 (1992)
Grammy to Big Kindy Kid (2011), Big Pre-K Kid (2012),
Grandbaby Appendage (2014), and New Baby Grandboy (summer 2017)