There is, alas, a lot of idiot plotting in SON OF OKLAHOMA. A small boy falls out of a Conestoga wagon in the Oklahoma desert,and cries for his parents to stop. They don't, but he's rescued by Julian Rivero, who takes him home to his wife and daughter, noting that the boy has found the gold mine Rivero has been looking for. Meanwhile, Earl Dwire shoots down Earl Homans (who crawls away, unnoticed), and returns to Josie Sedgwick.
Seventeen years later, the small boy has grown into Bob Steele. Rivero is about to register the secret mine in Steele's name, because Rivero is a Spaniard; they've been pulling ore out in secret, covering their trail. Dwire goes to Sedgwick, who's now running saloons; it turns out she only went with him to prevent him from killing her husband, Homans. He tells her that if she'll get the information on the mine from Steele, he'll go find the boy, whom he gave to a family on their way to California. When Steele turns out to have the note she wrote to her husband seventeen years earlier, she knows he is her boy, doesn't tell him, and never does anything about it until the plot requires it.
If you ignore these -- ahem! -- minor flaws, and the gold mine in Oklahoma, it turns into a minor western. I fear I could not, much as I enjoy Steele's movies directed by his father, Robert Bradbury. Also, Miss Sedgwick's line readings are pretty poor. This was her last movie.