My mother (mid 70s) and grandmother (early 90s) are obstinate. They wont even TRY to learn how ANY tech works. Neither even understand how to use their dumb cordless house phones 99% of the time. They both have dumb flip phones for emergencies and neither has a computer or tablet.
2 things I can tell you. 1. Regardless of what they WANT, get them tech that YOU can work with, and refuse to help them with anything else. And 2. Set realistic expectations, from the get go, on how much you can/will help them, and what YOUR schedule allows. Maybe it’s because my family are all narcissistic assholes, but they will suck you dry with the constant needs. I find that the older people get, regardless of their personalities they seemingly all get way more needy like toddlers or worse.