I am playing as the king of Norway and Denmark. I have just, for the second time, uncovered a plot by my wife to kill our youngest son. He's 7 years old and the only thing about him of note is that he's the heir to one little county that has no other claimants. All of my wife's other children are from the same marriage, so I don't see an angle there.
Please tell me that this is a bug or why this would make any sense.