Notification for family sharing
How do. Get rid of the notifications? The only option is to set it up. No opt out. Are you taking a page from Facebook/Meta?
iPad 2, iOS 9
I don't know what "the notifications" are. See if this article solves your problem:
Use Notifications on your iPhone, iPad, and iPod touch - Use notifications on your iPhone or iPad - Apple Support
There's likely to be a class of notifications that you can't get rid of. Typically they are warnings of some sort.