For got parent contral i user name

Need a faster answer?
There are 3 main user types in Mac OS
Administrator: Can do pretty much anything, including adding and managing other users, installing apps, and changing settings.
Standard: Created by an administrator. Standard users can install apps and change settings for their own account... can't add other users or change other users' settings.
Managed: Users who are managed with parental controls can access only the apps and content specified by the administrator managing the user.

Assuming that the parental account that you are referring to is indeed an administrator, there are a few possible solutions, some of which are version dependent. See here for details:

Five Ways to Reset a Lost Administrator Password
http://tidbits.com/article/14437
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