For me, it's canon, but not just because he resembled her, but because in her narcissistic opinion Sirius was the best of the Blacks, flesh of their flesh, born of two Blacks, handsome, intelligent, strong-willed, the true future head of the family. Sirius is the brightest star in the Black family's sky. The one who could show the world what it means to be a Black.
There's no reason to believe he was hated in his childhood for who he was. There are many reasons to believe he was adored. His arrogance was also nurtured by being told from childhood that he was special, that he was the best, that there were none equal to him.
Blacks were likely often rebellious, especially in their youth, for various reasons. So, after Sirius was sorted into Gryffindor, they didn't disown him (it didn’t matter that he was a child. The Blacks disowned/obliterated squibs from their lineage at the age of 11, like Marius Black). But they thought Sirius would eventually get his rebellion out of his system and settle down. That's when Walburga and Orion started trying to change him, to bring him back to the family, because they knew they were losing him. That's when the psychological abuse began. That's when the comparisons with Regulus started. Regulus was always second after Sirius, but he was close, always close, a dutiful son to his mother and father. A good son. Good, but not Sirius.
But the more they pressured Sirius, the more resistance he would show. Walburga knew pressure had worked with Alphard, her brother, and she thought it would work with Sirius. But it didn't.
Sirius "broke her heart." Walburga lost her son, whom she adored and loved, who could have been her pride, the perfect heir. Regulus remained, but ultimately she lost him too, and she spent her last years hoping to see her son at her doorstep, hoping he would return.
By the way, I think Sirius was not formally disowned. Walburga "burned" him from the tapestry at 12 Grimmauld Place after his escape, but Sirius remained a Black officially, he remained the heir. They still hoped, until the end, that he would come to his senses and return. (Or he was reinstated after Regulus's death).
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