I don't remember the Apple ID or password I used to set up my old iPad. I want to give it to my grandson. How do I transfer it to him without knowing this info?

Hello,

The iPad is locked with Activation Lock. There is no way around unlocking Activation Lock without inserting the device’s associated Apple ID. If this is not an option you will have to find the original receipt for the device that clearly shows the serial number. Once you have this document you can have Apple unlock your iPad.

Activation Lock