Lonely on the Mountain (The Sacketts) (original 1980; edition 1984)

The Sacket Brothers didn't know what brand of trouble cousin Logan was in, but he needed beef cattle badly.
So with Tell Sackett ramrodding, Tyrel, Orrin and Cap Roundtree rode north - pushing 1100 head across the wide Dakota plains toward the mountains of far western Canada. Past Sioux, past Logan's treacherous enemies,s, through uncharted trails, the Sacketts drove on.
Because when you step on the toes of one Sackett, they all come running.
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Shanty had a nice smile. "We've got you," he said. "There's no way you can get away."
I smiled back at him. "Then take me," I said. "I'm here."
Shanty hesitated. It worried him that I was not afraid. "You came," he admitted. "I never thought you'd make it."
"There are two more up on the mountain and by now they're beginning to miss me. They're getting lonely on the mountain, Shanty, and they'll come down."
"We will handle them."
"And there are more of us where we came from. Be smart, Shanty. Cash in your chips while you still can."
He laughed. "you know, Sackett, I like you. I'm going to hate to kill you."