Sephie is Cass's older sister, often offering protection and acting with more intuitive understanding of their family dynamics. She experiences teenage challenges and complicated family relationships as she navigates her changing body and identity.

Cass’s mom is a smart but resigned woman who struggles with the constraints of her abusive marriage in the context of 1980s rural America. She faces financial challenges and societal expectations while trying to provide stability for her daughters.

Cass’s dad is a charismatic and crafty abuser who manipulates those around him for his own benefit. He is an artist and drug dealer who oscillates between moments of kindness and cruelty, creating a complex emotional environment for his family.