Syncing the calendar of one phone to the other could be a wee bit challenging. The first way that comes to mind is to use the same GMail account on each computer (assuming, of course, that your wife also carries an Android phone). Sharing a GMail account, however, also shares email and contacts.
If, on the other hand, your wife doesn't carry an Android phone... well then my idea may not work!
I have a Samsung EPIC 4G/Galaxy S phone. I notice that my syn calendar will not syn completely. It did syn since I purchased...then it stopped last November. All others like books, contacts, gmail still sync without problems. I see a red exclamation point on Sync Picasa Web Albums and the sync button for calender does not completely synced..it was fully synced on 11/24/2011.
Yes, I use Google/Gmail calender on both my pager and my home computer (IMAC).
I am truly puzzpled...it worked fine for a while but not now? I have to type in events manually on both pager and online computer.