Do you think kimberly got along with arnold and willis when they first moved in the pinthouse she must have felt a little jealous that her father would be paying attention to 2 orphan boys instead of her, their is one episode from the first season where arnold is pissing everybody off because he is throwing water balloons on people, their is a scene between her and her father philip she says dont spank arnold you can break his tender loving bones, the way she said it sounded like she was giving her father the thought to break arnolds bones lol

http://www.youtube.com/watch?v=wPz87AZ2p14

Kimberly had no competition. She was her father's pride and joy. Willis and Arnold moving in didn't change that. I doubt that she ever felt jealous of them. She had no reason to be jealous. Her relationship with her father was firmly established. In many ways, she was still #1. Willis even alluded to this a time or two.