Start with high-confidence ya orphan & foster stories books, then narrow by subgenre or adjacent topics.
Thirteen Doorways, Wolves Behind Them All
Laura Ruby
Saving Red
Sonya Sones
Where the Heart Should Be
Sarah Crossan
A Northern Light
Hope Davis, Jennifer Donnelly
Interrupted
Zondervan, Rachel Coker
Camilla
Ann Marie Lee, Madeleine L'Engle
The Book Thief
Markus Zusak, Allan Corduner
Bridge of Clay
Markus Zusak
Hattie Big Sky
Kirsten Potter, Kirby Larson
Gathering Blue (for Pob Boxed Set Only)
Lois Lowry
Orbiting Jupiter
Gary D. Schmidt
Caprice
Coe Booth
Sync
Ellen Hopkins
Belle Prater's Boy
Ruth White
Sisters in the Wind
Angeline Boulley
Crossing the Tracks
Barbara Stuber
Homecoming
Cynthia Voigt
The Good Thieves
Katherine Rundell
A List of Cages
Robin Roe
Gather
Kenneth M. Cadow
Not Nothing
Gayle Forman