Yeah, those happen all the time around here too, planned. But, this was a spur of the moment dad decision that would have been easy to chalk it up to a bad airline and kids be disappointed for a long time. Instead, he turned around and headed south. I hope United treats them fairly.
I’m not minimizing what dad did but people in NJ (and all over the country) jumping in the car (rental or their own) to drive to Disney after their flights are cancelled happens very often. I know two people who did it last October/November. They didn’t turn around and drive home the next day but they paid out the butt for a one way rental then hit a park soon after arrival as not to lose money or upset the kids.