The deuteragonist and Olivia's love interest, known for his honesty and emotional openness. He shares a childhood connection with Olivia and encourages her to embrace new experiences.

Olivia’s grandmother, whose dementia impacts the family dynamic. Her past on Martha’s Vineyard is revealed through memories and items from her youth.

Olivia's stepmother, initially seen as an antagonist but later revealed to be caring and supportive. Her relationship with Olivia evolves as they come to understand each other.

A supportive character who has ties to Annie’s past romance on Martha’s Vineyard. He helps reveal Annie’s history and his role connects to Olivia’s current experiences.

Olivia’s father, a pilot who acts as a stable and understanding presence. He supports Olivia through family changes and emotional challenges.

Olivia’s younger half-siblings who bring lightness and straightforward observations to the family interactions. Their affection offers Olivia comfort and grounding.