First of all, sorry for your loss my man. Tough for sure. Maybe your parents found it ?? I don't know.
Are you in a Medical Marijuana legal state ? Maybe look into getting your prescript. Then talk to the parents.
If thats not an option, might be time to try and move out my friend. Get your own place, grow your own bud, and be happy. I would never grow pot in a house with people who don't want me growing, know what I mean ? Not to mention they are your parents man.
That said, check into Stealth hydro. They sell a buckateer system, simple and small, one bucket. Grab a couple CFL lights from the site. Easy to take care of, low electricity use, and small.
http://www.stealthhydroponics.com/product.php?xProd=93&xSec=53
Take care