[To clarify in case the wording was ambiguous: hopefully, neither parent now has cancer. One did have cancer, but has now finished treatment (as much as you ever do) and is theoretically OK (although given difficulties diagnosing and finding the cancer in the first place, there's an element of skepticism there, in terms of the potential for recurrence - but I guess that's usually the way). The other one has an unidentified complaint, and went for the "we'd better check if this is cancer because if it is it'll be horrible" scan literally the day after the first one's last treatment session, which seemed to be inviting a ghastly irony. But, a long time later (it's ridiculous how different the efficiency is depending on how fashionable the cancer type is!) the scans have come back and the diagnosis is now "nope, no idea what's causing that - have to wait and see, I guess!", but at least there's no obvious sign of any cancer, so it's probably not that, so it's probably not something important and will hopefully just go away eventually.]
[To be honest, statistically, cancer was never that probable. It's just that there weren't many possibilities on the list, and if it was cancer it would have been a bad one. And one of those "you don't see any symptoms until it's too late" ones, so there was a fair amount of trepidation, particularly our recent history with cancer. Made worse by the inanity of doctors. Doctors seem to have no ability to deal with conflict or distress, so they just tell you anything that they think will make you happy long enough to leave their office without causing a scene. In watching people with cancer (and indeed other conditions), repeatedly I've seen the same scenario:
Doctor One: oh, there's probably nothing to worry about. But maybe it would be a good idea if I sent these scans to Doctor Two,a specialist, just in case they might be able to see something...
Doctor Two: hello. I see from your notes that Doctor One has discovered that you have X!
Doctor One: I wouldn't worry - that's a possibility for some patients, but you'll probably be fine, so we probably won't need to do anything about...
Doctor Two: hello. As you know, you've been scheduled for surgery tomorrow. What? Oh no, we do this with all patients with your condition, without exception.
So now any time I hear "the doctor said there was probably nothing to worry about but we should do a scan anyway", I'm not just worrying that the scan might turn up something bad, but also that there's a 50% chance that the first doctor knew all along that there was something bad, even without the scan, and just didn't want to say it out loud in case someone got upset...
But the river tripped on her by and by, lapping
as though her heart was brook: Why, why, why! Weh, O weh
I'se so silly to be flowing but I no canna stay!