Liliana Berry Davis Mumy (born April 16, 1994) is an American actress and voice actress. She appeared as Jessica Baker in the Cheaper by the Dozen movies with Steve Martin, Lucy Miller in The Santa Clause 2 and The Santa Clause 3: The Escape Clause with Tim Allen, and was the voice of Mertle Edmonds in the Lilo & Stitch franchise's seq uel films and Lilo & Stitch: The Series.
Her father is actor Bill Mumy, known for his roles in the classic science fiction TV series Lost in Space, Babylon 5, and The Twilight Zone episode, "It's a Good Life" (Liliana appeared in the sequel, "It's Still a Good Life," while her father reprised his role), as well as one half of the comedy music duo Barnes & Barnes. Her father also appeared in Bravest Warriors.
Mumy was born in San Marcos, California, the daughter of Eileen Joy (née Davis), a childbirth educator, and former child star Bill Mumy. She is the sister of child actor Seth Mumy. She graduated from Laurel Hall School in North Hollywood, California and attended Campbell Hall School. She left there and had recently graduated from Notre Dame High School, Sherman Oaks, California. She is a fan of the Pittsburgh Penguins and the Los Angeles Lakers.