Missing admin user name

I'm trying to update some software on my father's AirMac and he can't remember his admin user name or where his back up disc.  is there any way around this?

However, if you have Lion, Snow Leopard's instructions are not applicable.
On Lion, you use the following technique to reset the Administrators password:
Boot to your Lion Recovery Partition, by holding down the Option key while starting, and then selecting the Recovery HD as the boot choice.
Once booted, at the top of the screen is a menu ..., select Utilities / Terminal from the menu bar.
In the Terminal window, type “resetpassword” (without the quotes) and press return. A “Reset Password” window will open. Select your boot volume (your SSD drive) if it is not already selected. Select your administrators username from the menu labeled “Select the user account” if it is not already selected. Follow the prompts to reset the password. Restart the computer from the apple menu.
Realize that by resetting your Admin password, your Keychain will be unaffected. If you forgot your password (admin passswords and keychain passwords match by default), you will need to start a new Keychain.

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    Above

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