Geronimo's ponies

From Library Journal: "Told in first person, it lets unfold a coming-of-age story that probes the relationshps between truth and memory, family secrets and self-discovery. Davey Parker and his widowed father, living on the Navajo Indian Reservation in Arizona, are visited by Uncle Eph, Davey's deceased mother." Eph has schemes to get rich quickly, but Davey becomed disillusioned by his uncle's deceptions, from lying about the worth of the horses to their true ownership.