"Something In The Rain" by Tish Hinojosa.
"..........somethings wrong with little sister, I hear her crying in the night......... and mom says, "Close your eyes, mijito (my little son), dream of someplace far from here, like the pictures in your school books. Someday you can take us there. Little sister's gone away, Mama's working long again. ......and the rains are pouring down, from the growers to the towns, And until we break the killing chains, there must be something in the rain."