I think it's ironic that your parents only said you couldn't download anything, probably assuming you're a moron who doesn't think and will download a virus as soon as you get the chance, and they're probably computer illiterate enough to fear them. Yet they have no qualms(or rather you haven't asked) about going onto random websites, filled with people who DO download them, and are technically doing something illegal.
My recommendation for you: if you have enough time to sit there and watch something for hours on end without them caring, then download, burn onto a CD, and delete all the files. Rinse and repeat until you have whatever episodes you want. You get your episodes in High Quality, and they don't even realize you're downloading. If they say something about it, tell them BitTorrent isn't a Direct Download. Which it's not.