“Again, what does brother mean here?”
Brother means brother. Josephus wasn’t writing in Aramaic and it would be superflous for him to mention “cousin” or Jesus if the relationship was not significant to his history.
Sorry, blue-duncan, your argument is with the great theologians of the Reformation. They weren’t convinced. And they were very careful men. I merely pointed out historical (history of theology, that is) fact.
I think that you can agree with me that Martin Luther was no friend either of the pope or the Roman magisterium. So, the question is, what possessed him, and virtually all of the reformers, to call this an adiaphoron (which is NOT agreement with Rome)? Do the research. Look into it. They were not stupid men, nor pro-Roman, nor ignorant, nor impious, nor unlearned.