Blood Ties

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

Lucy West, a citizen of Megaton, wants you to deliver a letter to her family in Arefu. But the task is not as easy as it sounds, as Arefu is under siege by the Family, a gang of wannabe vampires.

Deliver Lucy's message
Lucy West can be found in Moriarty's Saloon in Megaton. She asks you to deliver the letter even though she doesn't have any bottlecaps with her.

Arefu is a small settlement built at an old freeway overpass located northwest of Vault 101. When you arrive, shortly after a Family assault, it turns out that Lucy's parents are dead, with bite marks on their necks, and her brother is missing.

Find Lucy's brother
You are given three possible locations of 'The Family' A Metro Station, an Underground Hide-Away and a Drive-In Cinema. The Family are hiding in the Metro Station. Upon entering you will be approached by an NPC asking for you to find him Sugar Bombs head into the room he came from and in the door to the right. Through another door you will see two barrels of radioactive waste you need to go through the manhole in this room and through the subway tunnels until you eventually reach 'The Family's' hideaway.

You can convince the leader of the Family to protect Arefu instead of attacking it in exchange for donated blood packs.

When you find Lucy's brother, it turns out that he wasn't kidnapped, but voluntarily joined the Family. If you show him the letter from his sister, you can convince him to come back home.