Reset ipad
I’m going to hand down my iPad to my grand daughter, how to I erase all the apps I have on it and it is linked to my I phone, how do I unlink it?
iPad 2, iOS 9
This support page details the process that you should follow. This process will properly prepare the iPad (or iPhone) for reuse by a new user, erasing all locally stored data and removing the Activation Lock:
What to do before you sell, give away or trade in your iPhone, iPad or iPod touch – Apple Support