For sure! (Sorry, I'm doing this in the slow periods at work.)
So it's just the two of them, sibling wise. My thought was that they've been close for a long time, since there's only a 2-year gap between them. The family is from sioux falls, south dakota, and there are two cousins in game, ~styx and ~salon, through their mom's side. Her brother is the one she calls when she has a problem or needs someone to talk to.
Their mom is currently in the middle of throwing a bitch fit and basically telling Clarissa that she's not welcome back home. They don't talk because she doesn't approve of a lot of the things clarissa does in her life. So she's canceled her Christmas trip home and it's making her sad.