The Farm located near the Concord city is inhabited by a three-person family. They are farmers.
You can trade with Conny. However, she doesn't have many valuable items.
The owner of the farm - Blake - can give you the Returning the favor quest during which you must find the locket that belonged to her murdered daughter. For doing it you will receive some bottlecaps and lower prices when buying from Abernathys.
After completing the quest, the farm will become your new settlement. You will be able to collect all valuable items from there with no penalty.
During your first visit to the farm, you can witness an attack of the bloodbugs on the farmers. You can help them in defending, but you will not receive any payment for that.