Teen kills parents, sister after row over phone; stays in house with bodies, goes to gym, buys food, stabs mother's corpse again with knife

[Collection]A 13-year-old boy in Sao Paulo, Brazil, who was adopted, confessed to killing his parents and sister on Friday after they took his cell phone away, according to police on Wednesday. The local security ministry said in a statement that the boy called the police on Monday to confess to the triple homicide, which had gone undetected until then.