What Happened to Chris Benoit's 2 other children, David (born '93) and Megan (born '97)?

They would have been about 14 and 10 respectively. Were they found at the crime scene? Did they escape unharmed? I'm uming they weren't killed as well, since their deaths would have been mentioned in the main police report. Odd though that none of the press releases mention that he had more than just the child who was murdered. (Daniel)