Well first of all Atif I'm assuming your parents blocked these on purpose. So what you need to do is open Command Prompt and type in "ipconfig" then look for default gateway and enter that into your web browser. Next look up your router model and it's default password on Google and enter the credentials. Then look under parental controls, or other settings. It should be pretty easy to find.
If that's to hard for you to do, just download a proxy based browser like UltraSurf, you can google this and download it.