I think the way rules violations continued to be implemented in golf, either your call it on your self or a competitor must narc on you, is just going to keep escalating into these ugly situations in the case of the Dad. Emotions running high, super high stakes for everyone involved, competitive juices flowing, and then asking them to objectively referee themselves on top of that is just absurd.
Its time for the USGA to step up and assign a referee for the match to actively watch and call these things.
P.S. Please spare me the self-righteous bs about how golf is different, and a game of honor, yada, yada. Its clear that when it comes to high stakes competitions an independent 3rd party observer/enforcer is needed.