(Camden, OH)--Two Preble County brothers are both charged with raping a girl who was under the age of 13.  48-year-old Frankie Rader of Camden was booked into the Preble County Jail Tuesday and is being held without bond.  His brother, David Rader, is facing two rape charges stemming from an investigation that dates back more than a decade.  Prosecutors expressed concerns that there could be other victims and urged those potential victims to come forward.  David Rader is set to be arraigned Wednesday.