|Half-Brother of Annabeth Chase|
|Family||Fredrick Chase (father) |
Mrs. Chase (mother)
Matthew Chase (twin brother)
Annabeth Chase (half-sister)
|Appearances|| The Titan's Curse |
The Mark of Athena (mentioned)
Bobby Chase and his twin brother, Matthew, are Annabeth's half-brothers as they are the sons of her father, Frederick Chase who remarried to Mrs. Chase, Annabeth's stepmother sometime before The Lightning Thief.
He is seen playing with Matthew when Percy Jackson, Thalia Grace, Grover Underwood, and Zoë Nightshade ask Mr. Chase, Annabeth's mortal father, for help. His father is shown to confuse him with his brother, Matthew. Percy looks at the Lego toys scattered on the floor and the cookies in the oven and decides it's "not a bad place."
Although there is not much shown in The Titan's Curse about the family, it is shown that Frederick does not pay attention to Bobby and Matthew while at work. However, it is shown that Matthew and Bobby both care for their father.
She is the mother of Bobby and Matthew; but the step-mother of Annabeth.
Matthew's and Bobby's half-sister.
Matthew is Bobby's twin brother. The family has a hard time distinguishing one from another.