Lavena says her 17-year-old son, Trevor, has an out-of-control rage problem and fears he could snap and kill her, her husband, her 5-year-old twins or become the next school gunman. And, Karen says she’s at her wits’ end with her 15-year-old daughter, Nicole, who she says sneaks out of the house, uses drugs, skips school and recently stole her car. What’s at the root of the teens’ behavior?