To get to the router config you need to type in 192.168.0.1 yes? If so than you cannot use that IP because it belongs to the router.

Another cool thing to try is this:
Go get another router. They are pretty cheap nowadays, or you could just borrow one from a friend to see if it works. Put your router before your dad’s netgear. For example:

Out of the DSL/Cable box – In the WAN port on your router out one of the LAN ports – In the WAN port on the Netgear

If you can hide the box, aside from his router now having an internal IP on the WAN port, it could be transparent to him. You would want to assign the port/ip (depending on which your router supports) going to the Netgear in the DMZ. That way if he had special ports open for certain apps it would remain open for him. Plug your computer into your router and you are good to go.