It's pretty wierd, about 3 weeks ago i was tired of hiding weed so i thought of telling them. Whenever I came how high and they asked " are u on something?", I just said stuppid shit like "yea dad, i had some shots of heroin a few minutes ago". They thought i was trying to act funny so they just said " wateever, ur stupid go away". Then a week after i wanted to tell them i got caught . I smoked in my room and in the morning they smelled somwthing and later found ashes on my desk. I thought theyd be more cool with it but they flipped out. Id say keep hiding it untill u get caught. It all depends how ur parents are. They might say its a gateway "narcotic" like my parents did. Or they might be like my friends dad and let him smoke in his room instead of getting caught on the street by cops. So if i were u id hide it as long as possible unless ur parents r cool.