Answer: Fixation
Explanation: Fixation simply means being obsessed or preoccupied with a particular course or action. It occurs when an individual focuses all its energy or attention on a certain course or means such that the individual fails to identify other means other viable ideas which could cost lesser stress, energy, cost and even yield better results.
In the question above Kevin was entirely fixed or tied to using threat to make his children do what he wants such that he couldn't think or see other better ideas which could yield better results.
