My iCloud contacts and photos are now on wife's iPhone
All of sudden, all of my contact and photos are on my wife's phone. We have separate emails and Apple IDs. However, we do share an ICloud account.
Firstly, how can I remove all of this off her phone without her doing it manually, contact by contact, photo by photo?
Secondly, how do I prevent this from happening in the future?
Thanks!
[Re-Titled by Moderator]