In The Name of Black

On that fateful night of James and Lily Potter's death, young Harry James Potter is rescued and adopted by one Sirius Orion Black. Furious at Dumbledore for the Potter's deaths and his ignorance at Peter's doing, Sirius rejoins the Black family in support of the Dark Lord, bringing with him his son - young Cepheus Sirius Black, heir to the Noble and Most Ancient House of Black.