Regulus Black (also known as R.A.B.) joined Lord Voldemort's Death Eaters, then panicked at the seriousness of what he was asked to do, tried to back out, and was killed for it. In fact, Regulus turned against Voldemort and stole one of his Horcruxes, hoping to make Voldemort mortal so that he could be defeated, and was killed by the Inferileft as a trap by Voldemort.
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Walburga Black, the mother of Sirius and Regulus Black.
Book 7.While Harry, Ron and Hermione are staying at Grimmauld Place, They see Sirius's brother Regulus's bedroom door with a sign saying:Do Not Enter without the express permission of Regulus Arcturus Black.
I believe it is RAB, Regulus Arcturus Black.
Orion Black was the father of Sirius Black. Orion Black (1929-1979) was a pure-blood wizard and the eldest son of Arcturus Black III and Melania Macmillan. He married his second cousin, Walburga Black, and the couple had two sons: Sirius and Regulus Black. Orion and Walburga's disillusionment with the Death Eater organisation, Regulus' defection from the group, Orion's strengthening of his house's defences, and his and his son's death all coincide.
Druella Black nee Rosier, is the wife of Cygnus Black. Together they had three children; Bellatrix Lestrange nee Black, Andromeda Tonks nee Black and Narcissa Malfoy nee Black. Her brother and sister in-law are Alphard and Walburga Black. Her grandson is Draco Malfoy and her nephews are Sirius and Regulus Black (children of Walburga).