Carrie only cares about Quinn cuz he's (used to be) a weapon she could use, it was especially evident in the last scene at the funeral/church where she's wondering how Quinn could hurt her by not going back, while Quinn just wants to be all up in fattie fat.
The family is really being irresponsible, they should recognize that Carrie is a borderline Psycho, that happens to be really good at her job and is working to protect the US, at least i think they're doing this now to show that they tried. Later on, the sister is probably going to ask Carrie to give up the kid and she'll fully adopt the kid as her own, and Carrie can be the aunt. I hope we don't have big drams over this adoption angle(that i think we're going to go into) cuz the whole family thing is kinda boring, aside from the, murderous intent.