What's the chances of my parents finding out if I make a facebook without them knowing?

I completely agree because I recently got facebook after a long time of moaning and grumpiness. It's up to you if you want to make a facebook account but you never know. Maybe in the next few days your parents will think you can have an account and when they try to make one and put in your email address to find out that "That email address already belongs to a Facebook user." You'll be in more trouble than just leaving it!