lolz, kinda in the same situation, i live with my mom but she's never home... i pulled it off for a year before she noticed and even when she did, it was more of a problem becuase it was illegal then it being becuase it was cannibis, she doesnt care as long as i keep under 2 flowering plants for myself cause she doesnt want me to sell it, which i will respect becuase well i love doing it and its all for meimp:

I also talked with her prior to doing it hinting what i was planning on doing, and she said why waste money, why waste a reputation, having to go to scummy dealers in the area to get shwagg.

On the other note, if you lst your plants or scrog them u wont have to worry about letting them get to the top of the cab u keep tieng down the plant as it grows, i would say every 2-3 nodes you would tie down at 90 degrees, this has nothing to do with growing it, nutes etc.... Its simply training the plant to use the max amount of space.