SHEBOYGAN, Wis. (WHBL) - A 13-year-old Sheboygan boy will get a mental exam to see if he’s competent to help with his own defense for the brutal killing of his 78-year-old great-grandmother in Sheboygan Falls. Circuit Judge Timothy Van Akkeren ordered the exam yesterday for Antonio Barbeau, despite objections from prosecutors. Barbeau and 13-year-old Nathan Paape are both charged as adults with first-degree intentional homicide in the slaying of Barbara Olson in mid-September. Paape’s lawyer has not asked for an exam. A competency hearing for Barbeau is set for November second after his exam is complete. His lawyer, George Limbeck, said his client cannot understand the legal process for his defense – or an effort that will come later to try him in juvenile court. Prosecutors said the teens killed Olson while ransacking her house for money – and they got away with 165-dollars which they used to buy pizza and marijuana. Authorities said the boys also stole Olson’s car and jewelry. Limbeck said a brain injury that Barbeau suffered in a previous accident might affect competency. But Sheboygan County District Attorney Joe DeCecco (deh-check’-oh) said the injury was not serious enough to affect his competency – and there was not enough evidence that the mental exam was needed.