Calendar event duplication problem

Here's the details:


-My wife and I each have iPhones (5 and 5s)
-I use Google calendar (2 g calendars through one account) which I have set to show up on both mine and my wife's phones
-When I create an event on Google Calendar 1 on my phone, then duplicate it so that I can change one of them to Google Calendar 2, the events (original and the duplicate) get doubled on her phone (so I have 2 on mine, but 4 on hers).
-I can't just delete the extras, because even deleting one copy deletes it on mine.


Please help. Thanks.

P.s. If anyone cares why I have to do this, it's because one calendar is for work, so I need it on my phone but make it invisible on my wife's, but for a few of my work calendar events I have to have it on the other calendar so that my wife sees them so she knows not to book plans for us at those times. Thanks