Connect foreign Wi-Fi router with cable?

Is there the possibility to set up my father's Wi-Fi router (from 1&1) for a week (same city, different address) and to connect my laptop with the Wi-Fi using an old Wi-Fi cable? I'm coming back from Australia without Wi-Fi (in "self-quarantine") and my father is not currently using the internet anyway. Therefore I wanted to grab his router, plug it into the socket and connect it with an old LAN cable.

I'm very happy to answer!

Sure, you can connect it to yourself… But you won't get access to the Internet.

You also need the corresponding contract with Telekom, Vodafone or similar. And a corresponding telephone or cable connection.

The connection is with the daddy, not with you. With router you have no access to the Inet

you would need a contract

The 1&1 DSL contract is tied to your father's connection. You can use the Wi-Fi but without internet access.

With a Wi-Fi cable?

As long as the line is not busy, there's no internet from the outside to your TAE socket.

So that's not possible → so with a router installed, you get WLAN but no Internet access.

The neighbors will be new to you? Nevertheless, ask if you can get their Wi-Fi access data. Explain to them that you have just moved in and that no technician is coming.

Fritz! Boxes also offer guest Wi-Fi. This would make their data and their network "secure" and you can "only" go online.