Corporate media will be ever more obsequious to get access. Military presence for “safety” in certain cities labeled “dangerous” which all happen to be progressive. Then the self-censorship starts. Then people stop being able speak freely, let alone thinking a rule of law exists. Then it’s “underground” to have an honest conversation about politics. We’ll be in Putin’s Russia level of legal system and political speech within a few years.
I would encourage you to learn more before sharing; there may be treatment options, you might have a cancer that is very treatable, unknown or untreatable. Likelihoods and timelines are the most important thing that your family will want to know; sharing “stage 2 cancer type x and this is a general treatment plan and timeline” is a very different conversation from “I have cancer, don’t know what type, the timeline or likelihoods of outcomes”.
It may be different for you and your family but that can really help your family receive, process the news and support you how you need.