You couldn’t use GMRS, which doesn’t require a license. You’re too far.
The basic ham radio technician license isn’t hard to study for and pass. But your folks would have to at least understand how to use the radio and listen; and be able to transmit, if you wanted that - also requiring a license.
On the other hand, there might be a ham person in their neighborhood who could help you in a serious emergency.
But it’s not like telephone. As long as cell or landline phone service were available, you could communicate that way; but in a major SHTF situation where everything shuts down or is interfered with, I’m not sure there’s a lot to suggest.
(I really miss old-fashioned landlines.)
Sorry, I meant FRS, not GMRS.
GMRS requires a license. It's currently $70 for ten years. Good for the whole family. No testing required. Price was supposed to come down to $35, but hadn't as of December 2021.