In this scenario, your dad just installs Jellyfin and logs in.

You’ve set up the reverse proxy to your server, its transparent to him.

You can update DNS records automatically so its also a fire and forget kind of thing.

But I guess, give your data to the corpos because its easier.

There are a ton of reverse proxy options that manage the cert for you

A reverse proxy is a trick? That’s like standard practice for web servers.