Thicker than Water by W.C. Tuttle

The two men faced each other across the little table in the living-room of the Circle Spade ranch-house, in the light of a single oil lamp. The younger of the two men was Jack McCoy, known as "Angel," while the other was Rance McCoy, his father, and owner of the Circle Spade ranch.

Angel McCoy was rather tall, well muscled, with features as clean-cut as a cameo. His skin was almost as white as milk, his hair as black as jet, and he wore it long in front of his ears -- a swinging curl of inky-black against his white cheek. His eyes were brown, shaded by sharpcut brows. There was no denying the fact that he was handsome.