I don't know how it would have gone remotely, but no issue in-person. I opened an invite QR on my device, asked parent to open camera, and point it at code. They get the gist that the app name is Snikket, they get notifications of messages and calls, and the layout and icons are pretty similar to every other messaging app. I am going to attempt it with an in-law who only just stepped into the smartphone era this month, has no familiarity with a smartphone interface, and is the least technical person I know.