Bizarre and sordid crime noted

Well, that must have been a challenge for Children's Services:  The Guardian reports on a truly unusual crime in England, in which the parents of 6 children (from their incestuous relationship) murdered two of them, and tried to kill the rest.

One very strange detail, perhaps indicating that the kids might not have had the best of educations?:

“The children believed and even told officers at the scene that their father was dead, having died in the second world war.”

(The eldest children were teenagers.)