No, you are not- Sirius did have an uncle"who left him a bit of gold".
Also, assuming that Sirius had a little money before going to school, it is possible that he had all that money for all those year sand did not get to use until Harry was 13-15. And then of course he would get Harry a broom, cool books and the like.
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Also, assuming that Sirius had a little money before going to school, it is possible that he had all that money for all those year sand did not get to use until Harry was 13-15. And then of course he would get Harry a broom, cool books and the like.