I would also suggest that your spouses do not carry their PR cards in their wallets (unless they are travelling). A friend lost his wallet - with his PR card - and it was not easy for him to get it replaced and it took several months. It was not as simple as contacting CIC and having a replacement card sent like a driver's license. I'm sure they want to make sure people are not falsely claiming a lost card to give to someone else. During that time he could not travel outside of Canada.
sorry Anna if this is off topic and not the right thread to be posting this info