Video: Connecticut school shooting: Adam Lanza's mother taught him to 'be responsible' with guns Nancy Lanza, whose gun collection was raided by her son Adam, then used to kill her before Friday's massacre at Sandy Hook school, was part of the "prepper" movement, which urges readiness for social chaos by hoarding supplies and training with weapons. Her friends told NBC's Today Show that she kept her guns "under lock and key" and was always very responsible. When asked about reports that she had taken Adam and her other son to shooting practice, one friend said: "She told me that she wanted to introduce them to the guns to teach them - especially Adam - a sense of responsibility." "Guns require a lot of respect," he added. She really tried to instill that responsibility within him and he took to it. He loved being careful with them, he made it a source of pride. Pictures courtesy of NBC's Today Show