The references in the New Testament to the brothers James, Joses, Jude and Simon, and sisters (whose names are unknown) of Jesus have led to much discussion. Some suggest that the terms “brother” or “brethren” could denote near relationship such as cousin. We understand, however, that the Greek originals translated “brothers” and “sisters” are unambiguous and that they bear the meanings normally associated with them. There is no necessity to believe that the “brothers and sisters” were later children of Joseph and Mary. In fact the available evidence suggests that it was not so.
The records which exist relating to the last days and death of James, suggest that he was a much respected “figure in the Church” by which time he had become known as “the Just One”, a name probably won by years of devoted service. It might not be too far wide of the mark to suggest that James was born about 20 B.C.
The Origin of the Organic World – Part One