Draco Malfoy. His mother is Narcissa Malfoy (née Black), who is the cousin of Sirius Black.
Others are, distantly. Harry himself is very distantly related to Sirius, because the Black family tree shows a Charlus Potter and Dorea Potter (nee Black) marrying. Ron Weasley's parents are both somehow linked to the House of Black, with Molly's uncle having married a Black and Arthur's mother being a Black before she married Septimus Weasley (and being subsequently burnt off the family tree for marrying a 'blood traitor'). Neville Longbottom is also distantly related to the Blacks.
This is the case with a pureblood family such as the Blacks, much to Sirius' amusement when he shows Harry the family tree. In order to keep the bloodline pure, many wizards and witches end up marrying relatives. Sirius' own parents were second cousins before their marriage!
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Draco Malfoy. They are second cousins.
The Weasley family are also somewhat distantly related, all pure-blood families are.
No, Sirius Black is Sirius Black, Remus Lupin is someone else. (Actually they are close friends.)
Sirius Black
Sirius was a bear like dog, probably a mongrel or something like that
From Wiktionary: "snuffle: to sniff with the nose loudly and audibly". Sirius Black had the capacity to turn into a dog.
The name Sirius refers to the star of the same name. Sirius is the brightest star in the night sky. It is also the brightest star in the constellation Canis Major (Great Dog) it is sometimes called the Dog Star. The name Sirius Black therefore fits very nicely with his ability to transform into a large black dog. Several of Sirius' relatives are also named after stars and constellations.