Where is the Family in fallout 3

The Family is a gang of self-proclaimed vampires that live in Meresti Station, east of the settlement of Arefu. They have been frequently raiding Arefu, and the mere mention of their name invokes fear in even the most intrepid of Arefu residents. They have also abducted Ian West, the brother of Lucy West, and left the West parents dead. Evan King pleads with the Vault 101 Dweller to deal with them, and gives hints to the Family's home.
One of these vague clues involves a trip to Northwest Seneca Station. Murphy lives in the station with his bodyguard making Ultrajet. However, Murphy's back room has a manhole next to vats of toxic waste. The tunnel leads through Mirelurks and eventually, a booby-trapped subway. The entrance to the Family's home is to the left, past Robert the Family sentry. Going straight through leads to the exit by Meresti Trainyard.
It is easier to enter the Family's home through Meresti Trainyard as the Mirelurks are bypassed.
Vance is the Family's leader; he can strike a deal in which the Family will protect Arefu in exchange for donated blood packs. It is revealed that Ian was not kidnapped, but voluntarily joined the Family. If you decide to convince Ian to leave The Family, the Family will accept his decision and allow you and Ian to leave unharmed.
Attacking (or killing) anyone in Arefu will cause every single person in the Family headquarters to turn hostile towards you (Excluding Robert, who will turn hostile if you attack or kill any members of the Family). (my source is Fallout.wiki.com