More than a week after five members of a family were stabbed to death, neighbors in a quiet Tulsa suburb are still coming to grips with how such brutality could happen here.

Some here are also trying to recall any signs that might have pointed to the July 22 rampage, which left David and April Bever and three of their young children dead.

On Friday, prosecutors charged 18-year-old son Robert Bever and his 16-year-old brother, Michael Bever, with five counts of first-degree murder and other crimes.

Neighbors say they attempted, in vain, to involve the kids in activities or make small talk when they saw them outside playing, but nothing worked.

Tamela Massey is David Bever's sister. She says the family was "very quiet and private."