The Hold Out

The Hold Out is a side quest in the Fallout 4 add-on Far Harbor.

Detailed walkthrough
This quest does not become available until Rite of Passage is completed.

Start the quest by talking to Mitch in Far Harbor's bar, The Last Plank. He will ask the Sole Survivor to check on his uncle and possibly bring him back to Far Harbor.

Travel to National Park visitor's center. Beware of the mines and traps near the entrances, but try not to disarm them since they will help later. Once inside, talk to Uncle Ken and tell him that Mitch asked to check on him. He will immediately warn of an imminent trapper attack. The Sole Survivor can use the workshop immediately afterwards, but resources are slim at the visitor's center, providing approximately enough materials for 2 Heavy machinegun turrets.

Repel the attacking trappers. Once they are dead, talk to Uncle Ken again. With some difficult charisma checks he can be persuaded to go to Far Harbor; doing so will cause Uncle Ken to be present when returning to Mitch and change the dialogue slightly, but provide no additional rewards. Regardless of the result, return to Mitch for payment. After the quest is completed, Mitch will send 2 new settlers to the location. If the player character did not convince Uncle Ken to leave, he will remain in the settlement and become a settler.