Sirius knows from the beginning of the book that Harry's at the Dursley's. He goes there to see Harry before going to Hogwarts, and Harry sees him as the Grim. As to how he'd know, Hagrid told Sirius that he was on Dumbledore's orders to take baby Harry to the Dursley's (I think he told him that much). Even if not, it's logical - Sirius would know that Petunia is Harry's only living relative.
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Date: 2004-05-25 12:01 am (UTC)Sirius knows from the beginning of the book that Harry's at the Dursley's. He goes there to see Harry before going to Hogwarts, and Harry sees him as the Grim. As to how he'd know, Hagrid told Sirius that he was on Dumbledore's orders to take baby Harry to the Dursley's (I think he told him that much). Even if not, it's logical - Sirius would know that Petunia is Harry's only living relative.