Short Prologue
The Grangers were a normal family, well-off but not arrogantly so. The parents, Juliet and Douglas, were dentists. Juliet was a surgeon; Douglas was a pediatric dentist. The couple was happy, well loved, and parents of two cute twin daughters. They knew that the twins were only identical in looks, but they loved them all the same, with their quirks and peculiarity.
Because, yes, the twins were peculiar. Sometimes, strange things happened. Books floating from the highest shelves to the ridiculously well-read Hermione, or an enraged canine acting suddenly like a cute puppy with Titania. Teachers who were finding themselves incapable of remembering the lesson after berating an annoyed Titania, or bullies finding themselves punching the headmaster of the school after trying to bully Hermione.
So yes, the twins were peculiar. And they were vastly different from each other in every way but physically. But they were cute and lovely and their daughters. So, the Granger couple didn’t mind. And the little family was happy, wealthy and almost normal.
And one day, a certain professor Minerva McGonagall was there to explain why the girls were peculiar. And that day, the Granger family was entering the magical world.