I would rather not be quoted on my views as to being caught but I'd like to give my two cents.
I'd say if there's a chance of getting caught by the authorities (it doesn't sound like there is) never do it, your parents will be the ones in shit.
As to your parents finding out it is your gamble, imagine how they would react and also the possibilities of them finding out. Care to your plant at something like 3am when your parents will not be awake and in deeps sleep, or whilst they are it work for example. Don't take a chance. If you think you can get away with it, go ahead man, also think about how your parents would react to you growing (genuine) medicinal marijuana. I'll be growing some medicinal white rhino from attitude seed bank in a couple of months, which i am really excited for, according to attitude it is good for ms arthritis and (more commonly) insomnia.