Hogwarts and the Elixir of Life

Character

Character (invented by me):

Eve Potter - Harry's sister, 3 minutes older, raised by Severus Snape

Lydia Grindelwald - descendant of Rovena Ravenclaw, related to Salazar Slytherin and Gellert Grindelwald, has 3 younger siblings, when she was a few years old she persuaded her parents to change her and her siblings' surname to the surname of her mother's father

Anthony Grindelwald - Lydia's brother, an hour younger than him

Drago Grindelwald - Lydia's younger brother, and Anthony's older brother

Hugo Grindelwald - the youngest in the family, one year younger than his siblings (of little importance in this part)

Of course, people from the movies will also appear

PS. I'll skip the beginning of Harry learning about being a wizard