Hello tjg4286,
Welcome to Apple Support Communities.
We understand that your father forgot his Apple ID and password. We are happy to help.
These steps may help your father find his Apple ID and reset his password.
How to find his Apple ID: If you forgot your Apple ID email address or phone number - Apple Support
"See if you're already signed in with your Apple ID
Check to see if you're signed in on your device. Or check if you're signed in to Apple apps or services
On your iPhone, iPad, or Apple Watch
- Tap Settings, then tap your name.
On your Mac
- In macOS Ventura, choose Apple menu > System Settings, then click your name.
- In earlier versions of macOS, choose Apple menu > System Preferences, then click Apple ID.
On your PC
- Open iCloud for Windows, then look for your Apple ID under your name.
How to reset your Apple ID password: If you forgot your Apple ID password - Apple Support
"Reset your Apple ID password on your iPhone or other trusted Apple device
- Go to Settings.
- Tap your name > Password & Security > Change Password.
- Follow the onscreen instructions to reset your password.
You can also follow this process on a trusted iPad, iPod touch, or Apple Watch.
To reset your password on your trusted Mac, choose Apple menu > System Settings (or System Preferences) > Sign in with your Apple ID (or Apple ID). Then click Password & Security, Change Password, and follow the onscreen instructions."
Let us know if you have further questions.
Take care.