Griffen is Caitlin's 14-year-old cousin who has a pretty difficult time sharing his home and family with his rebellious relative. Griffen is the uptight good kid to Caitlin's carefree mischievous kid. An over achiever, Griffen's pretty popular and even started his own rock band--but he still catches a lot of flak from Caitlin for being too concerned about his future. Though they're very different and they're often at each other's throats, Griffen and Caitlin learn to trust each other and actually end up becoming close friends.