Episode 314, "The Other Lane"
SEASON 1, EPISODE 107 - Military academy dropout sneaks through his kid brother Simonís bedroom window, asking in vain if they could both to go to Yukon together. Simon has just been admitted to and is looking forward to attending Yale University. At the dinner table, their abusive dad severely taunts the elder son about his school expulsion, until the cadet draws a pistol and shoots dad in the arm. His mostly ambivalent mother calls the police, but when the SRU arrives, Simon tries to cover for the runaway. When the Simon starts trusting Sam, insight about both boys' dark past help explain startling plot twists.