Help with this movie title

I saw this when I was young in the early 80s. A mother and son move in with or have an extended visit to her native american father who buys his grandson a horse for 75 dollars, the horse has an injured leg. The boy is upset and complains to his mother that his grandfather bought him a crippled horse. At the end of the movie the boy has to leave his horse there because he and his mom are leaving.

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