Q: iPhone 4S Stuck on Activate iCloud Account!

Tthere are alternative ways to recover and/or change the Apple ID and password, but they all involve knowing something about it. Start with this link and see if you can use any of these methods.

Apple ID - Official Apple Support

If none of them work, having ownership proof is helpfull, but you'll need to make a Genius appointment at the nearest Apple Store.

Apple ID - How to find your Apple ID

Apple ID - Find

Enter your Apple ID and click Forgot Password.

Apple ID - Manage

Did you try the 1st link and click Forgot Apple ID?

There is a contact link.

Apple ID Support

Apple ID Support (2)

If you are the original owner, take the phone, the original purchase receipt, and a photo ID to the nearest Apple Store.

If you have the documentation that proves your Dad is the original owner, you can contact Apple and submit that to them. After verification, they may be able to remove the activation lock from the device.

Otherwise you have no solution.