Resetting IPad for new owner
How can I reset my iPad for my grandson to own but still keep the apps he likes?
iPad
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These are the steps you should perform:--> What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
In this way the device is like a brand new device (starting from scratch).
I suggest that your grandson creates his own Apple ID & password, then download his preferred apps from AppStore.
Regards
Giulio