War it is in “Uncle Carl.” With Frank (William H. Macy) lying to Sammi (Emily Bergl) about her trailer in “Rite of Passage,” Sammi withholding Frank’s anti-rejection medications in “Crazy Love,” and then shooting him in “Tell Me You Fucking Need Me,” let me tell you, you ain’t seen nothing yet. Their incessant need to win leads Frank and Sammi into an all-out War of the Roses.