For the most part, people change based on relationships, not raw information. In general, you can’t counter a belief simply by presenting overwhelming information. (This is one of the only areas where Trump is a savant; he’s actively fostered a parasocial relationship with his cultists. They believe that they have a strong social relationship with him, so they’re inoculated against information that’s critical or negative of Trump.) What this means is that ideas can be contagious, and can spread through relationships. If you are able to use you relationship with your parents to help them understand why e.g. Trump is terrible for the country, then they can, in turn, spread that to their friends.
While I appreciate your desire to abolish capitalism, in the case of fascism, it’s not money, but power that’s at play. Even if you eliminated all profit motive, people would still shill for Trump because they think that they can get some kind of benefit that isn’t necessarily monetary.