(Portland, OR)  --  An Oregon man and his three children are among those killed after two planes collided in mid-air over a lake in Idaho over the weekend.  The Kootenai County Sheriff's office says 48-year-old Sean Fredrickson of Lake Oswego was killed in Sunday's crash over Lake Coeur d'Alene along with his son and two stepchildren.  The family was on a Brooks Seaplane being piloted by 58-year-old Neil Lunt of Liberty Lake, Idaho when it collided with a Cessna plane.  Both planes then plummeted into the lake.  Police believe eight people were killed in total.  They're still working to identify and recover the remains of all the victims.