But have you asked God? He might have some spare essential oils.
Objection! The defense requests for the prosecution to... er... stop doing that.
Madness string 93441
In any enterprise - business, military, academic, sports, etc. - leadership gets the behavior that they reward. Being a parent is a leadership position, and these parents have taught their other kids that acting like the middle sister is the behavior that they reward. They can't be surprised that their other kids have learned the lesson they've taught.