This is a 46 page, detailed guide on how to code your very own crypter. (You don't need to know much about coding, this guide has a template you can build off of. Super easy.)
A crypter is a program used to make things like; RAT's(Botnets), Keyloggers, things like that, completely invisible to antivirus programs.
You could put a keylogger on your child's computer to keep an eye on his computer habits. The crypter is needed so that it remains undetected by antivirus and stays on the target computer.
This guide is extremely detailed and is noob friendly as long as you know how to code decently. If you need to brush up on some coding check out my other listing on Programming Guides.