Nah, built over years most likely. Like getting divorced because "he throws his socks on the floor." That's the match that lights the fire of hay gathered over decades

Yeah there's obviously some tension from the kids and the stepmom. But if you read the article everything was starting ok enough until the kids thought she was using his miles which they were entitled too (as an aside, what a stupid thing to throw a fit over)

The airlines miles were just an example. There was much more.