It is safe unless you get busted federally, or if you go over your limit, or you get popped smoking with people that don't have their card, etc. So no, its not really safe for you to grow in your parent's house.
Plus, if you have your card, that means you are at least 18. This means you should be growing weed in your own home, not mooching off your parents.
If you want to grow pot, be responsible enough to not risk your friend's or family's well being.
Dude I have respect for you bro, Im not trying to bash on anybody or anything, this is just a good convo.
It does depend on the circumstances, why they grow at home, theres a number of reasons, there not all bad.
I would love to move out but Im at College right now so I have no money for an apt. and I dont plan on moving till at least Im done with college and also its only about a 10 min drive from my house to the campus so whats the point ya know what I mean haha.
Want to know something funny though? My neighbor is really close with my family and I, she knows Im growing and she works for the FBI, shes seen a lot worse and shes gone every few weeks for Business in crazy ass places so I doubt FBI are gonna freak about situations like this. She could careless as long as Im not selling it(im stingy as hell so im not anyways ha) or growing it in mass quantities.
Its the best thing in the world, its only a matter of time before it becomes Legal!
I wouldnt worry to much about things happening as long as people aren't dumb with there shit then your all in the clear and besides thats there problem not ours..haha