The AppleID was used to setup the iPad. . . so that it could share their family data. When he set up his emails on the iPad, I am also wiling to bet he also set up her email on it. Therefore, their two emails are sharing the AppleID for archiving data. Voila. His and her data will be on both. It's a common practice among couples.
They did state they shared the Notebook. . . and if they did not bother to set a separate Apple ID for his or her separate user partition. . . it is a natural consequence of not doing that.
Appreciate your reply.
How do the Black Berries tie in?
Note that the aide also as a Mac.