I can’t give the parent angle, but my wife depends on me and she doesn’t worry anymore. I calmed her worry with knowledge. The worry was rooted in ignorance, really. That somehow I would wind up hypo and die from it, because this is a random risk that strikes people down “out of the blue”.
So what actually causes a hypo overnight? Either too much basal or too much left-over IOB from eating. So in my case why aren’t these something to worry about. What are my mitigating practices so that I’m not subject to an overnight hypo? Well, I’m not at risk from IOB because I always check my IOB and BG before going to sleep, and make sure that I have enough carbs in my system to use up the IOB. I’ll take glucose before going to sleep if need be. And I’m not at risk from too much basal because every morning I check the trace of overnight BG. If I see that it was falling all by itself overnight I’ll back off on the basal a little bit for the next night.
Now that’s a bit of an oversimplification, but it’s an effective explanation for a non-diabetic, because it turns a random adverse event into a predictable consequence of things that I control, and my wife believes that I’m responsible enough to control them.
Do your parents suddenly find themselves stranded on the side of the highway because they’re out of gas? If not, you can use that analogy. You don’t run out of glucose in your bloodstream overnight because you make sure you have enough before you go to sleep. Just like they make sure they have enough gas before they set out on a trip. This is something that is routine and controllable, not some random adverse event to worry about.
The other thing in my case, which you don’t have, is CGM. My wife knows that there’s a trustworthy CGM watching over me, and that before I get in trouble it will wake me and I’ll take the glucose. Not that a CGM is a 100% guarantee, but that it makes the risk so low that we don’t have to worry anymore, like we don’t worry about all the other low-percentage risks that surround us. Before CGMs, parents would watch over their children by setting an alarm clock and measuring the child’s BG in the middle of the night. Those practices are becoming archaic for those of us who enjoy the privilege of current technology. I’m hopeful that this will become more widespread in the future. The Verily Gen 2 may be a helpful step in this direction.