Apply for an exemption. Read the following though:
An exemption may be granted to:
A country driver who requires the use of eight or more cylinder Four Wheel Drive (4WD V8) vehicles if there is no practical alternatives
A person who can prove they owned the prohibited vehicle prior to 11 July 2005 or before an interstate/overseas licence transfer (attach proof of acquisition).
Note, only a provisional who has never held a NSW licence before his/her licence transfer can apply for this exemption
A person who can demonstrate any other exceptional circumstance, (attach any information necessary to support your exemption request).
An exemption from the prohibited vehicle condition will not be granted simply on the basis that the only vehicle available in a household is a prohibited vehicle.
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Obviously in your case, you might get in under the "eceptional circumstance". If your dad is sick or whatever and needs a lift to the hospital every so often, i would be getting a letter from a doctor to support this, especially outlining that YOU are the only one or main person who needs to drive him, and then attaching the proof that the R33 is the only car in the family that can be driven.
If you have another family member at the same address with a non-prohibited vehicle, you have very little to no chance.
Here is the application form:
http://www.rta.nsw.gov.au/licensing/downlo...mption_dl1.html
FYI, it costs $30 to apply for the exemption, and you don't get it back if you get denied.
Hope that helps. All the best with it.