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
Finding Lucy's brother, abducted by the Family becomes the new objective. They can be found in old train tunnels southeast of Arefu. There will be traps on your way, including an exploding baby carriage and a chunk of meat swinging on a chain.

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.