After Erin Caffey’s parents forbid her from seeing her older boyfriend, she convinced him to kill her entire family. — Erin & Charlie Erin Caffey, a 16-year-old from Alba, Texas, met 18-year-old Charlie Wilkinson at her part-time job at Sonic, a fast food joint. Her parents did not approve of the relationship and worried that Wilkinson would be a bad influence on their daughter. The Caffeys, a church-going, musically inclined family, noticed Erin’s…