Greg's most immediate goal is to vent his fury and frustration and teach Sandy a lesson. Yet his longer-term goal is to strengthen, not weaken, his relationship with his daughter and help her become more responsible and respectful. If Greg stops and thinks about his broader goals, he will realize that how he handles this situation could significantly affect his relationship with Sandy and, perhaps, her character. If Greg is to turn this event into a positive teaching moment, he will have to choose his words and his tone carefully. No good manager would yell at or demean an employee because it would be ineffective and unethical.
Parents have no lesser duty to be tactful and respectful when dealing with their children.
For KNX 1070, this is Michael Josephson reminding you not to suspend good judgment or good ethics while dealing with your children because character counts. I'm sorry to say I became one of them. In the short term it may have helped, but long term it came back to haunt me. There's no amount of success that's worth it. I am now 48 years old.