Apple account associated with device.

[CharlieKasper]

How do I find out which account is the iPad registered to?

In iTunes and app store settings, it shows the account I want to keep.
In icloud settings, it shows the account i don't want to keep
in facetime it shows the account i want to keep
in imessage, it shows a bunch of accounts and numbers i don't want to keep

so which id is the iPad reistered to?