Okay so the new season of Greek is coming up if you haven't seen the last season here's a quick and easy way to get you caught up on some of the characters in the Greek system.
So Frannie is Casey's big sister, who is Rebecca's big sister, who had sex with Evan while he was dating Casey, Evan who got dumped by Casey and now has a thing with Frannie, his little brother is Calvin, who is friends with Rusty, who's actual big sister is Casey but fraternal big Brother is Cappie, who used to date Casey but is now dating Rebecca, who used to be Evan's best friend and is Egyptian Joe's little brother.
Glad we got that cleared up. I'm just here to help! 8)