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Your question really has two parts -
Question number 1 has already been discussed many times on this forum. I will answer question 2.
It is likely that Ananias was referring to Paul as a "brother" in the same way that Stephen referred to the Jews as "brothers" and "fathers" (Acts 7:2). There is no way to know for sure.
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Ananias already had news from God that Paul would become a brother of Christ. Paul probably became a "brother in Christ" during his conversion on the way to Damascus.