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You're a strong girl, and I know you can use everything I've taught you to survive alone. Please, forgive me, sweetie. I only wanted to make the best for us. Daddy loves you very much. Goodbye...”— A note from Little Moonbeam's father
According to Sydney, he was a terrible father and abandoned her without warning. However, he loved his "Little Moonbeam" very much, but died during an exchange gone bad at the Statesman Hotel. He lived long enough to record a message to his daughter in hopes that she would find it in the future.
Sydney's father is mentioned only in Fallout 3.
- The Lone Wanderer: "So, whatever happened to your father?"
Sydney: "I thought he was the best. My mom was long gone, so all we had was each other. He used to call me his "little moonbeam." How sappy is that? But when I was 14, he vanished and left me all alone. Never even said goodbye. I cried for a week. Do I have to tell you what it's like for a young woman alone in the Wasteland at that age? I don't know where he went, and I don't care. I just hope he got what he deserved, the son-of-a-bitch!"
- The Lone Wanderer: "Nice gun. I've never seen one like that."
Sydney: "Yeah, it is nice. I don't even sleep without it under my pillow. My father made gun ammunition for a living. Taught me everything about how firearms work. So, I've spent my downtime tinkering with guns like my 10mm Ultra SMG here. It's like a hobby I guess."
- A note from Little Moonbeam's father