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Sirius Black is the last heir of the House of Black, a once notable pure-blood Wizarding family. His parents, Orion and Walburga Black, were both Blacks by birth
and second cousins. Sirius had a younger brother, Regulus, and three older cousins: Bellatrix Lestrange, Andromeda Tonks (his favourite cousin and mother of Nymphadora Tonks), and Narcissa Malfoy
(mother of Draco Malfoy). He rejected his family's pure-blood elitism and reverence for the Dark Arts. At Hogwarts, the Black family were all sorted into Slytherin, where as Sirius was placed in Gryffindor.
In contrast to his home life, Sirius greatly enjoyed life at Hogwarts, where he was inseparable from his best friend, James Potter. Sirius and James were immensely popular and known for
their exceptionally good looks. Sirius and James often went out of their way to bully Snape, whom they despised for his great interest in the Dark Arts. They also became best friends with another
student, Remus Lupin, whom they later discovered was a werewolf. To support Lupin, Sirius, James, and another friend, Peter Pettigrew, secretly (and illegally) became Animagi, which allowed them
to safely accompany Lupin during his transformations and keep him under control. After mastering Animagery, Sirius's form took the shape of a huge black dog, from which his nickname Padfoot was derived.
Sirius left home at the age of 16 and took refuge with James and his parents. His outraged mother burned his name off the family tree. After leaving school, Sirius fought against Voldemort, eventually
joining the Order of the Phoenix. He remained close friends with James and eventually attended James and Lily's wedding as best man. When their son, Harry, was born, Lily and James named Sirius Harry's godfather. After
the happenings of "Prisoner of Azkaban" he was like a mixture of a father and brother for Harry and they keep in touch via owl-letters.
(wikipedia)