What is one major difference between Chris and his Sister,Carin?

From the text:

Like Chris, Carine is energetic and self-assured, a high achiever, quick to state an opinion. Also like Chris, she clashed fiercely with Walt and Billie as an adolescent. But the differences between the siblings were greater than their similarities. Carine made peace with her parents shortly after Chris disappeared, and now, at the age of twenty-two, she calls their relationship “extremely good.” She is much more gregarious than Chris was and can’t imagine going off into the wilderness—or virtually anywhere else—alone. And although she shares Chris’s sense of outrage over racial injustice, Carine has no objection— moral or otherwise—to wealth. She recently bought an expensive new home and regularly logs fourteen-hour days at C.A.R. Services, Incorporated, the auto-repair business she owns with her husband, Chris Fish, in the hope of making her first million at an early age.