Hi there dragify!
You need to know both the Passport email and password of the Live account and the Passport email and password for the parent account associated with the Live account. You can also do it easier online at http://www.xboxlive.com - just sign in with the Passport email and password of the Live account, go to "Manage Profile" from your home page thingy, hit "Family Settings", sign in again with the Passport email and password of the parent account, and you can change all the parental controls on the next page. From looking at that page, you basically want all options on the first button for each thing to turn off all restrictions completely.
- With kind regards, Timmie.
