Allright, here we go:
iStig, no matter what keep at it. As already mentioned, do not pester your father, as that will not help, but you already seem to be aware of that.
You want your dad to buy the Model S. You already covered the performance and the qualities of the car, and that did not seem to do it. So the question is why do you want him to buy it? Is it because it is cool? Hip? Trendy? (I have no clue what term you kids use these days ;-))
Or are you in it because Tesla is the role model for future car manufacturers? Can you (and your 'young' friends) afford that we ('old folk') all keep burning oil, just for our local transportation needs? Will there be enough of it? How much will you be willing to spend when you get to drive? Is it OK that countries wage war over it? Is it OK that burning fossil fuel seems to mess up your future atmosphere? And I'm not only talking about CO2. There is the smog, the small particles, the pollution of the environment. (I'm sure you heard about a few oil-spills here and there). What about the future economy, if we all keep dependent on fossil fuels. Is that going to be a 'free' market?
Now look at how Tesla and the electrification of local transport can make a difference: there is no shortage of electricity (just look up how much energy the Sun sends our way every single day). There are opportunities in renewable energy production that your generation will be able to use. Even today, singing up with a renewable energy provider, you can become independent from fossil fuels. Electric vehicles also do not produce smog from their tailpipe. So if charged right, they are super-clean, and will help in giving your generation a better environment. Solar panels provide direct clean energy to your house and perhaps car, so you are less dependent on foreign suppliers. Making it easier to choose where your electricity will come from.
So for your own sake, keep at it. Get your father of oil.
ps: there is always the quote from Jay Leno: Electric cars will save the Petrolhead, as it will allow us to keep driving those iconic cars.