Regulus Arcturus Black
Cedrella is Sirius' greatgrandfather's brother's daughter. (His mother's father's father's brother's daughter)
Regulus Arcturus Black
No, Sirius is his godfather. Harry doesn't have any siblings.
yes
Regulus Arcturus Black
Regulus Black, Sirius' younger brother.
Throughout the Harry Potter books, there is no mention of Sirius ever having a romantic relationship with anyone. However, Sirius "loved" his best friend James Potter like a brother.
Regulus Black, Sirius' younger brother.
Yes, Regulus Arcturus Black was a Death Eater. He discovered Voldemort's Horcruxes after Voldemort borrowed Kreacher, his house elf, to hide one of them. Harry and Dumbledore find the locket Horcrux, which is the one Kreacher helped hide, and discover it is a fake. Inside is a note left by R.A.B who planned to destroy the Horcrux. Regulus gave the Horcrux to Kreacher, told him to destroy it and we then killed by the inferi. Nobody knew he had betrayed Voldemort until Harry, Ron and Hermione discovered he was R.A.B.
Sirius' brother, Regulus Black.
Regulus Arcturus Black (R.A.B) Sirius' brother.
His father, Orion, died the same year (1978) as Regulus Black (Sirius' brother) in unkown circumstances. Walburga Black, Sirius' mother, died in 1985 but her portrait remained in her house, 12 Grimmauld Place.