Libertad by Alma Fullerton
With their father gone to America to make money for his family, Libertad, his little brother Julio and their mother scrape a living out of a dump in Guatemala City. Although it is too late for him, Libertad is determined that his little brother should go to school. Taught to play the marimba by his father, Libertad uses his talent as a street musician to raise enough money for his brother's school supplies. But his dreams for their future are destroyed when their mother is killed in a freak accident. Libertad must face the inevitable truth; they cannot survive on the streets of Guatemala City alone. There is only one thing to do. They must set out on the long and lonely journey to the Rio Grande River, where they plan to cross the water and enter the United States to find their father.