- For homes with close family (parents and siblings), I setup a subnet router and local DNS server on a Dell Wyse, making it one of their DNS servers so it can point them to services

- Yes, they should have their own account. However you can only add a few before you need to move to a paid version

- You can disable the expiry for nodes, which should keep it connected and prevent you needing to sign in again for them, for the most part