How to hook an iphone 3gs up to an ipad and how to reset this?

My dad said that he'll hook my iphone 3gs up to the ipad so he can see everything i'm doing at all times i have at&t. I don't want him to see all my stuff. How do you do this and how do you reset so he can't see my stuff? Is this even possible

I don't know how he plans on doing this unless he means that you both will have the same iTunes account so he'll be able to see your Apps/iMessages…
turn iMessage off