If you tell Dad, I'll make it hail on your head.
No one got anything past Dr. Doom.  No one, that is, except the occasional shenanigan perpetrated by Danica Von Doom.  She wasn't quite certain why it was she managed to sometimes get away with things, though she suspected it had something to do with her mother.  Most people knew the story of Victor and Ororo Von Doom: some stuff went down, Latveria v.  Wakanda style, Dr. Doom ended up striking an off-book deal with the then-queen of Wakanda and after several months of her being his "permament guest" her marriage to T'Challa was over...and her marriage to Doom began.  That was public record, but what few knew was that Dr. Doom, cranky weird old Doom, genuinely loved Ororo and in time she loved him and well...

...at some point Kristoff got himself a little sister who could drop a cyclone in his bedroom as a show of affection.  The little girl was very much the shiny metal apple of her father's eye, very much like her mother in her abilities and behavior and so Danica surmised that it was her father's fondness for her mother that generally let her get away with anything short of murder.

Including those cyclones dropped on a certain elder brother.  And as for that brother, Danica was very fond of Kristoff, so much so that when she did manage to pull something over on their father, it was he that she knew she could trust.  Now that she was more or less grown it was no different, which is why she sought him out this evening, whilst her parents were otherwise engaged.

"Kristoff?"  Danica poked her head in a door.  "You around?"