Fiesta, 1980 by Junot Diaz

In Fiesta, the protagonist appears to be a pre-teen Dominican male, who I understood to be the same only, slightly more grown-up central character in The Sun, The Moon, The Stars.
In Fiesta, there is a moment when Yunior is watching his mother at tia Yrma's party that he is overwhelmed by his feelings for his mother and her predicament.
I found Yunior's examination of his mother's life to be truly moving, because so much was happening within him at this time. This moment points to the fact that Yunior was already preparing for the loss of his family life.I find it most interesting that after having experienced the discord caused by Papi's infidelity, Yunior would, in his early adulthood, be unfaithful to his girl, Magda. He felt so terrible lying next to Cassandra that he called Magda to tell her he missed her. He sees his relationship with Magda as one that hit a rocky patch of road and he sees himself as a true optimist who is sure that all can be worked out.
It is unfortunate that the adult Yunior can't see what the young Yunior did. He can't see that due to infidelity he is without Magda in much the same way he imagined Mami to be without Papi.