Prairie Moon

Prairie Moon is a 1938 American Western film directed by Ralph Staub and starring Gene Autry, Smiley Burnette, and Shirley Deane. Written by Betty Burbridge and Stanley Roberts, the film is about a singing cowboy who takes care of three tough boys sent west from Chicago after their father dies and leaves them a cattle ranch.

The boys have trouble adjusting to Western life on the ranch and long to return to the city. While they spy on Gene as he proposes to Peggy at a barn dance, general store owner Frank Welch Stanley Andrews, Legss secret partner, leads a cattle rustling raid. The local ranchers chase after the rustlers, but the cattle seem to vanish. The ranchers do not suspect Welch, but when the boys see him riding out from behind a waterfall on their ranch, they realize what has happened. Welch tries to befriend them, saying that their father was his good friend. When the boys tell him about Genes plan to adopt them, Welch comes up with his own plan.At the adoption hearing, Welch and his wife offer to adopt the Barton boys. Gene agrees to the offer because he is unmarried and the boys say the want to go with Welch. Sometime late, one of the boys has a change of heart, and when he tells Gene what has happened, Gene produces a phony Mrs. Barton and her three children. The judge then rules that Brain, Nails, and Slick are imposters, but Welch detects that the plan is a trick. He plans to do away with the boys and secretly remove the rustled cattle from their ranch. Gene intervenes, however, and Welch and his gang are captured. Afterwards, Gene and Peggy plan to marry and adopt the boys, despite Frogs concern that they will be getting more than they bargained for. ........

Source: Wikipedia