The box is dated during the time of James' death (63 A.D.) and the inscription is written in aramaic, which was the language spoken by Jesus. For a brother's name to be inscribed on a box of the deceased means that the brother has to be, in fact, the brother of the deceased, and/or one of great prominence, special in some way, or the person being the one to bury the deceased.
Merri
M erri C .Pemberton