A family acquaintance says Adam Lanza, who killed 26 at Sandy Hook Elementary School, had not seen his father for two years, despite the father's efforts.NEWTOWN, Conn. — The troubled young man who shot and killed 26 people at an elementary school had not had contact with his father in a nearby town for the last two years, despite his father's repeated efforts to repair the relationship, a family acquaintance said Tuesday as most students in the trauma-stricken town returned to school amid funeral processions.