Ok. Do you know if it uses a wireless access point (like a separate router), or is it just a connection between two computers.
If the latter, you will likely need to configure ports and things on the internet connection sharing setup on your dad's computer. If the former, there will be a web page configuration tool, available through an address like http://192.168.0.1, http://192.168.1.1, or http://192.168.2.1 (try all of those).
If you are unsure, ask your dad.
__________________
With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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