There once was a manor on a hill. The manor had sprawling gardens and a sweeping terrace and was filled with fine art and elegant furniture and servants for every room.
There was also a girl.
This girl lived with her father, a wizard of old blood and high standing. Her mother died when the girl was very young, and her father doted upon her. She never wished for a single thing, not a doll or a book or new robes or shoes. Her name was Ella.
When the girl was reaching school age her father began to dread the thought of his daughter going so far away. So he employed a governess, one well-versed in all the classes his daughter would have attended at Hogwarts.
The governess was not beautiful and she was of Muggle birth, but she was very, very clever. It soon became apparent that the little girl’s father had fallen under the thrall of a love potion. Before long, they were married, and the woman brought with her two daughters from her first marriage.
These daughters took after their mother in looks but sadly not in talent- they were both Squibs. Ella at first tried to befriend them, but they refused to play the magical games she knew and snubbed her when she tried to join their Muggle ones.
Now, it is known that eventually a strong and powerful wizard can overcome a love potion if exposed to it at length. After a year of marriage, it became apparent to Ella’s stepmother that her husband was beginning to fight the effects of her potion. So she ensured that her final batch included a few special ingredients.
After her father’s funeral, Ella turned to her stepmother and sisters for comfort. She found none. She was stripped of her fine clothes and jewelry, forced into the servants cast-off clothes and set to work in the manor. Her wand was locked away in her stepmother’s room and she was forced to clean every fireplace in the manor of ash and Floo residue. Her sisters, now wearing her beautiful robes and living in her opulent bedroom, simply laughed and began to call her Cinders-Ella.
And Ella curled up on her cot in the cold, dark attic and cried.
~Part 1 of the Cinderella story as told to pureblood children