You shouldn't be growing in your parent's house without their consent. If you do tell anyone, which I am sure you will since you are only 15 (not an insult, but 15-year-olds have a hard time not bragging about stuff like that), and they tell the cops, your parents would get in shit ten times worse then you.

You really should wait until you have your own place. You don't have the right to put your parents in that kind of legal danger.

And please note, I don't think you're a bad person or anything, and I am not trying to be mean, but it is terribly terribly inconsiderate to grow in someone's house without their knowledge, as they are the responsible parties.