If you aren't just blowing smoke (:smokin up our rears, since your story changed about your mom knowing, then I advise this.
Build your own grow box, tent style. Make the frame out of PVC tubing and the dimensions to fit in a corner of your closet. Cover with whatever material you can get that won't melt, spontaniously combust and won't let light out. Make a flap to open/shut and use velcro strips to keep it secure. CFL's don't get real hot, but hot enough, so you'll need a vent of some sort. Plants will smell after a point, so you'll need some way to get that out of there or filter it. Sounds cool to have a room reeking of the chronic, but it won't stay in your room.

In all honesty, and I'm not trying to guess your thinking/construction abilities, grow em outside. Accidents happen and their reach can be far and long lasting. If one does happen, try to minimize the ramifications to one person... you. It's easy to blow off opinions of people you don't know, especially when the opinions seem like attacks, but the opinions here are from people who know. Their gracefulness in getting the point across might be lacking, due in part to age, locations, experience, whatever... but if you can read between the lines and be open to the message, you might actually see that they are only trying to help you and yours, even if you might not be. I know how entrenched your thinking can get about growing, one little thought and then that's all you think about. Your young and have the resources to grow "safely" in the near future with your bro, wait it out, learn the craft, educate yourself. If you can't wait, there's nothing wrong with trying your thumb in the woods. Just no need to drag your mom into something you honestly know she isn't keen on. Respect her house and you'll be much more mature and earn her respect for it.

Good luck, bud.