Have you tried clicking on [b]Check Status[/b] button on your wife and son's account ( Open Bullguard, main button on left hand side, [b]Account [/b]tab)?
If still no joy try getting them to enter ...
It could be something to do with this known issue.
[url=http://www.bullguard.com/support/known-issues/resolution.aspx#updates2]http://www.bullguard.com/support/known-issues/resolutio ...
Your Username is just your email address, and you use a password of your own choice. See step 4 of this guide.
[url=http://www.bullguard.com/support/product-guides/bullguard-interne ...