Money Thicker Than Blood By Adam Smith

Dagwood Berg is on the outskirts of two big Montanaland, run by Kyle Montana and his son Kenny and daughter Rachel, and the Bar SG, run by newcomers Tom Morgan and his two sons, Caleb and Joshua. A feud between the two families begins when the Morgans dam the river. When Kyle Montana is killed and Tom Morgan attacked by a bushwhacker, Sheriff Hal Branch sets off to track down the unknown killer. But Kenny Montana has other ideas.