Cinderella has great potential to be a real-life story. She is treated like a slave by her family and forced to do all the housework etc, and is forced to stay at home. I've unfortunately heard stories of girls and women who are treated in just such a way (in Canada). Some of them get their happy endings, some don't.
If we look at Beauty and the Beast metaphorically, then it could also be a real-life story. The Beast would be any nasty person who is softened by the influences of the person playing the role of Belle.