What kind of story is "Lullaby"?

"Lullaby" is an arresting and immensely sad story about
the passing of life and also the passing of the old ways of life of the Yeibechei, or
Navajo Indians. The major character, Ayah, has accepted the poverty of her existence
with her husband, Chato, but now the two are old and they can no longer keep the home in
which they have lived. There is a low moment of Ayah’s bitterness when she realizes that
the family is losing the home, where she gave birth to her many children, all of whom
have been lost to them: "The illness came after the white rancher told Chato he was too
old to work for him anymore, and Chato and his old woman should be out of the shack by
the next afternoon because the rancher had hired new people to work there. That had
satisfied her. To see how the white man repaid Chato’s years of loyalty and
work"