Hi I’m looking to unlock an iPhone and give it to my grandma but I don’t have the Apple ID

Is it activation locked to an old Apple ID of yours?

Try to recover that Apple ID via iForgot.apple.com

If you cannot recover the Apple ID and you have valid proof of purchase information, you can start an Activation Lock support request.

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

The Apple ID and Password will be required to do this. Without that, I'm afraid the phone is not going to be useable.

Try iforgot.apple.com to see if that might help.