Who is Makepeace from Caleb's Crossing: A Novel and what is their importance?

Makepeace is Bethia's older brother. Slower witted and less intelligent than she is, he is at the same time more conservative, more negative, and more judgmental, attempting to exert power over Bethia that he hasn't necessarily earned. As the narrative progresses, he becomes more and more compassionate, even to the point of helping Bethia through some difficult times.