If they're old enough to read a greeting card, they're probably old enough to know Santa isn't real. But they may not be old enough to know the real reason the bedroom door gets locked for 30 minutes every night. Then again, if your marriage is anything like most married couples, the door probably only gets locked for 5-10 minutes every two to three weeks. This Christmas greeting card is filled with humor. Who doesn't like a cute cat in a Santa hat?