Somehow I remember the days when I was sneaking to the computer at night and, trying to produce as little sound as possible, was programming a laaaaarge platformer until morning. I had to pretend I was reading a book before sleep, and when everyone calmed down, I started at around 3 AM. Also, I had access to administrator accout and so could delete all the history (I remembered all the places where it was stored). But in your case you are being totally watched and restricted by parents who actually know how to use the Parent Control system and are aware of computer security. If you didn't bring the situation to this extent, you may have had a chance, but it's all lost to you. Just compel yourself and stop using computer at all. Draw pictures or something, when no one is looking.
SexyFurryGal
I shall try dis! \(>~<)/
3DPitDudez
Do it man! It's really fun!