Matthew,
The brother is a Pioneer in a line infantry regiment, as designated by the crossed axes on right arm. Photographed post-1874, as he is wearing the 1874 pattern dress tunic, but prior to 1881, when the pattern of tunic changed and the Long Service Good Conduct stripe that he is wearing on his right sleeve above the trefoil knot changed the left arm. The crossed rifles on his left sleeve indicate that he was the best shot in his company, the badge would later be styled the Marksman's badge.
Isandlwana