Subject clarity

Is it clear that the 'his brother' refers to Raistlin, Caramon's twin? Justarius continued to take on more of Par-Salian’s duties over time, and the great archmage eventually retired following an incident in 356 AC in which he helped Raistlin’s twin, Caramon Majere, traverse through time to thwart his brother's plan to challenge the evil goddess Takhisis for her position among the gods.