Sydney Ellen Lucas (born July 11, 2003) is an American child actress with credits in musical theatre, film and television. She is best known for her portrayal of Small Alison Bechdel in both the original Off-Broadway and Broadway productions of Lisa Kron and Jeanine Tesori's musical Fun Home. For her portrayal of Small Alison she won an Obie Award and Theater World Award and received nominations for a Drama Desk Award and a Tony Award for Best Featured Actress in a Musical. She currently stars in the main cast of AMC's western drama television series The Son as Jeannie McCullough.