Originally Posted By: Archeon
I did restore it from the backup of my iPad 2, from my computer. (I don't use iCloud, except for contacts backup etc, but not the whole device). I can't remember ever entering my wife's ID, that's what's so strange about it.

Did you ever plug in and back up your wife's device in iTunes on the same computer account? IE, do you and your wife share the same iTunes on the computer, or does she have her own computer account and iTunes library?