B. M. Bower 
Range Dwellers 

A millionaire’s son who’s gotten somewhat out of hand is sent out to Dad’s ranch in Montana to reform. Years ago his father had gotten into a lively feud with some neighbours, the Kings, whose ill-will is still as strong as ever. Naturally our protagonist falls for their beautiful daughter. There’s a jolt of added energy in his handful of encounters with peppery old man King. (Goodreads)