I heard from my mother. Here we have the same characters: the cruel step-mother, cinderella and 2 sisters. But the story is the opposite:
Once upon a time there was cinderella living with her step-mother who lashived all her care and tenderness on her, never allowing her to do any hard job. However she was rather stern toward her own daughters, made them work hard, wash, clean, cook etc.
People passed and wondered and asked her about it, but she would only smile and say:"I know better, you will see."
Years passed and the girls grew up. Now it was the time for them to get married. The two daughters of that lady found good men and were prosperous as they were accostumed to hardworking, were not lazy and could do the housekeeping very well. But cinderella end miserable as she didn't know how to work and how to be patient in life!