How to stop eBay notifications on multiple iPhones?

I am currently getting eBay notifications on both my iphone 5 and my wife's iPhone 4S. The 4s was my old iphone.

I have signed out of my eBay account on the 4s but I still get notifications on it. I have also deleted the eBay app and reinstalled but still get notifications.

How do I stop my wife's iPhone 4S from getting my ebay notifications?