Sometimes the KEY is preset and written on the bottom of the unit. key is 10 or 26 hexadecimal characters. The key is displayed as a serious of asterisks "******" as opposed to the clear-key key. This is a basic security feature on most home broadband routers. If you reset the router config as someone here suggested you'll erase the configuration and the existing key, requiring you to set up the router from scratch.
If you do not know the key you will need to create a new key and assign this new key to both your fathers and your laptop. try to change the key at 192.168.2.1
hope this will help.
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