Way of the Lawless by Max Brand

Uncle Jas was completely bowled over. Over against the wall as the door closed he was saying to himself: "What's happened? What's happened? " As far as he could make out his nephew retained very little fear of the authority of Jasper Lanning.

One thing became clear to the old man. There had to be a decision between his nephew and some full-grown man, otherwise Andy was very apt to grow up into a sneaking coward. And in the matter of a contest Jasper could not imagine a better trial horse than Buck Heath. For Buck was known to be violent with his hands, but he was not likely to draw his gun, and, more than this, he might even be bluffed down without making a show of a fight. Uncle Jasper left his house supperless, and struck down the street until he came to the saloon.