I so wanted to love this but there wasn't enough there to love. Was it an exercise in showing how banal and self-interested people are? The only truly interesting person in the story was the oldest brother, so naturally, his character and development were the least explored.
On a side note, I listened to the audio version of this, and the performance was...frustrating. Some of the male voices were so bass-intense, I had to keep fiddling with my equaliser to keep it from hurting my ears, and to make it understandable. Others, in contrast, were so faintly done, I could barely hear them. AND, as if that wasn't bad enough, I was constantly distracted by the thought that black men, adopted as infants and raised in the heights of upper-crust Boston, going to private schools and then to Harvard, do NOT talk like the just stepped out of "the hood", or have pseudo-southern accents. Both of those are stereotypes that the narrator leaned on to distinguish the black male characters from the white male ones, even though both were raised in the same environment, same schools, same parents, etc.