Mickey330 said:If you are on iOS 6, you'll have to get him out of the Facebook account in two ways - via the app and via your Settings app.
The easiest way is to delete the Facebook app. Then, go into your Settings app and go to the Facebook tab. Delete your son's info and put yours in.
Then, go back to the App Store and re-install the app. After it instals, open it and you should be able to log right in with your info. And, you're done.
Hope this helps. Good luck.
Marilyn