just plant your plants outside man. easy as pie. as far as i'm concerned, it's your parent's call in their own home.
if you can, do what i did when i was at home. convince your parents you need cannabis for medicinal purposes, and that growing your own is easier, healthier, and more productive than dealing with numerous doctors to acquire toxic and addictive medication. i was addicted to pills and heroin living at home when i was 16. i used cannabis to deal with quitting sleeping pills and methadone. harm reduction was growing weed in my opinion, at which point, my parents were happy to let me grow cannabis in their home. your situation should dictate your need to cannabis. if you just like getting high right now, i'm sure you can wait until its warm outside.