Following in His Footsteps

 is a Fallout 3 quest. It is also an Xbox 360 and PC achievement.

This is the quest to find James, the Vault 101 Dweller's father, James, who mysteriously disappeared from Vault 101.

Objectives and walkthrough
Investigate the nearby town of Megaton for information about Dad.

in Megaton anyone will point you to Moriarty, who seems to know you and if you ask him enough he will say you were born outside the vault, and then taken in there and brain washed, he will tell you the wereabouts of your father if you give him caps. If you lack the necessary caps, you can retrieve some for Moriarty from a lady living in Springvale. Also you might try to convince Gob into telling you those information, but it is implied that he will suffer Moriarty´s fury if he does. you can also hack his computer, or use lady killer on one of his employees to gain the password.

Further investigation leads you to Vault 112 where Dad is trapped inside the Tranquility Lane virtual reality chamber.