Everything you need to understand or teach Far From the Tree by Robin Benway.
When Grace becomes pregnant and has to give her baby up for adoption, it sparks a desire to reconnect with her estranged biological mother. She learns that she has two long lost siblings, Maya and Joaquin, who were adopted or fostered by different homes nearby. The siblings come together and share what it feels like to be misfits in their own home. As their bond grows, they learn what it truly means to become a family.