There's an old Serbian anecdote that has a bearing on this.. While I can't get all the linguistic nuances in there, I'll get the point across..
A man bumps into another man.
-Excuse me, I'm blind
-It's ok, but who clawed out your eyes?
-My brother
-Ahhh that's why he dug so deep
.
I know throughout history sibling rivalry runs deep, but never for a parent to do a mass genocide of their offsprings