When you are on the quest to find your father, stop by Vault 112. Once you enter the Tranquility Lane, stop by and talk to Betty. Once you have talked to her, go make the boy cry. Talk to her again afterwards. Make your way into the abandoned house and activate these objects in the following order: radio, pitcher, garden gnome, pitcher, cinder block, garden gnome, and empty bottle. This should activate the portal to your right. Go to the terminal and follow through there.