Rat Bastard (2014)

In a desolate, near-apocalyptic Van Nuys, California, two young brothers--Rat Bastard and Bad Andrew--struggle to survive on their own. Their allegiance to each other is put to the test when Rat, feeling that his brother can no longer support the two of them, decides to join the Dirtys, a violent preteen gang of masked twerps that rules over the local child underworld.