We use FaceTime for other slightly more tech capable relatives. If it was setup out of the box, they could likely pickup a call. But I know setting up a new iPad or iPhone can be tough when you struggle to understand what WiFi even is! Ideally I’d ship them an already working device, perhaps the same way we would setup a kids iPad, with FaceTime, and ship it to them.
I wonder though if there’s another low hassle solution? Or other tech I should be looking at that nails this use case?
In more normal times I’d go to their house. They’re unfortunately a few hundred miles away...
Or you could ship them (along with the router) an Echo Show or a Facebook Portal (I think the Portal is easiest to set up and use). This is about as simple as you can get for video calling, but these devices aren't very portable.