I think you overestimate the technical capabilities of my family or their eagerness to install software. When I ran Plex, and nobody ever installed the Plex app like I recommended to them, even though it's one click away in all the app stores.
Tailscale is exponentially worse, though. Not only would I have ask them to go to Jellyfin and sign up and log in, I would have to explain that they can't do that until they've installed the Tailscale app (which I have to explain because most non-techies do not know what a VPN is). Tailscale requires its own account, so they have to first sign up to that, and I have to add them as an external user first.