DO NOT GROW IN A HOUSE WITHOUT THE OWNERS KNOWLEDGE/PERMISSION!
you will be risking your parents reputation, careers, home and FREEDOM just to smoke a little bud. i will assume you haven't givin much thought to what could happen if leo found out or else you wouldn't be attempting to grow in your parents house without them knowing. it is a much safer, more responsible and mature choice to grow outdoors. imo, there is not much chance of successfully hiding a grow from someone living in the same house with it unless they are extremely unobservent and don't have a sense of smell. what ever you decide to do good luck. oh yeah, don't forgot about the karma you could incurr by doing what you are proposing, is it worth it?