What does the reader learn of Chris’s family?

Chris' father is an aerospace engineer, who owns a consulting firm. Chris' mother is a partner in the firm. The couple has two children, Chris and his sister Carine. Walt, Chris' father, has five other children from a previous marriage. Carine and Chris are very close, they look alike, and they're both extremely intelligent. Carine, however, is far more outgoing and easygoing than her brother.