In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Parents
If you dream that your parents are calm and smiling then in the coming days you will have some very pleasant social interactions that will invigorate and delight you. To dream of your parents when they are no longer living is a warning sign, whereby they protect you from an impending difficulty.