iPad mini 1

He is going to have to recover it. There is nothing that you can do until he removes it. He can start here, If you forgot your Apple ID - Apple Support then he needs to perform these steps before giving you the device. What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support

Even if you get that iPad working, you are going to find it very difficult now to get iOS 9 compatible apps for that iPad.

Third party app developers have all year been in the process of abandoning all app support for any 7, 8 and 9-year old iDevices running iOS 10 and earlier.

You will find that finding iOS 9 compatible apps will be mostly non-existent and that iPad will be at the end of its useful life for a brand new user.