Honestly, the easiest thing to do is put it on a mesh VPN like Tailscale and connect their streaming device to your tailnet. If they’re non technical parents then if their TV OS doesn’t support Tailscale, you can pick up a Walmart brand ONN streaming box for <$50 which supports for Tailscale and Jellyfin.
Yes the needs of your very special child are so unfathomably different from all the other children in the planet lol