ok growing with parents around is tricky but easly done if care is used
for the size issue i suggest a new plant rather than a new spot. The wardrobe is fine for small plants such as lowryder or lowryder #2 and they're auto flowering witch i find great coz you can pretty much keep your lights on all the time or not you cant realy go wrong
for the smell, the first crop i did it the smell wasn't THAT bad but noticeable if your parents are on the ball so maybe get a hamster or some thing like that coz animals stink too and the combined smell of the pet and the weed will mask it plus giving you a perfect little fucker to hand the blame on you get confrunted
what country are you in?is growing outdoors an option? if you live in a village or small town there is ALWAYS somwere to grow your weed outdoors with very little risk because your only at the plants for like 10-20mins 2-3 times a week
hope some thing out of all that babbling mess has helped.
Keep tokin'