Well I don't know how they'd find it, but if somebody did, something bad could happen. I'm guessing that they probably wouldn't take your parents house, but if it was OK to grow a big plant, a lot more poeple would be doing it. Think about it this way, how much might that plant yield? Then how much would that much weed cost on the streets where you live? It's probably a lot, and there's only one reason why it costs that much.