Stop Saying Wife

I really have to work on my vocabulary.  I was at work the other day talking to a customer and I realized I was saying wife rather than ex-wife.  Co-workers ask how are the wife and kids and I respond. I'm not too sure if it's just habit of saying wife or if it's my way of not letting people know that I am divorced.  In any event, I have to make myself stop saying wife and call her what she is - my ex-wife.