Your family had withdrawn from magic for a while, so that you were not in danger during your childhood, since they had many enemies. And one day they decide to send you to study at Hogwarts

The day has come, when you would go to Hogwarts

At the house selection ceremony, the hat put you in Slytherin's house. When you sit at the large rectangular table

Theodore: so it's true Grindelwald's daughter is in Hogwarts... He said with an arrogant smile