I posted a similar thread awhile back with my parents. Yea, because I smoke weed they call me drug adddict and what-not. Dad says that it will ruin my life and I will be a bum, just scraping enough money to go buy more, yea he calls it "dope". Nevermind that I have a suit'n'tie job, graduated with high grades and test scores and am about to attend college. My advice, is to just wait it out and let it be. I have learned the hard way that sometimes, you just cant change their views and beliefs. If you can realistically move out, than go for it. Otherwise, I say just keep everything on the DL and just blaze with the cool bro.
All in all dont let it get you down man, nothing is forever and soon youll have your own place where you can grow,have tons of bongs everywhere and blaze from dawn to dawn.