This parental situation is sadly repeated endlessly in the US. My dad is a wealthy retired tech executive whose mind was seemingly taken over by Fox News. He's kind of now in an anti democratic cult and he gets angry if he is even exposed to other news sources.

You don’t actually know this. Plenty of parents have stopped interacting with their children over politics, and vice versa.

Really think you should consider not giving advice to people from a place of ignorance regarding their individual family situations.