However, Sirius was not the only child of his parents, Walburga and Orion Black. He had a younger brother called Regulus Black, who became an unlikely crusader against the Dark Lord. Regulus Had ...

In a significant way, Order of the Phoenix is the brother novel to Prisoner of Azkaban. The third Harry Potter book is when Harry first learns of Sirius Black, and the fifth is when he has to say ...