The Youngest of the McMahons

This novel revolves around the youngest McMahon, Phil. Excerpt: He had been warmly welcomed by Tom and Matt, who forthwith determined to make him settle down on the ranch and ultimately join their gang of horse thieves operating on the Border. They had skillfully organized it, but they needed one who had Phil's popular gifts, his daring, and resource, his ingenuity and brains, to carry through their boldest proposals successfully. Neither of them had Phil's gifts or looks, though in one sense Tom McMahon was a handsome man, with a strong blue eye and well-molded head, a fine full beard, while in stature he far exceeded Phil. Yet he did not inspire confidence, and Matt was a little better.