Liliana Berry Davis Mumy (born April 16, 1994) is an American actress. Between 2002 and 2006, she appeared as Jessica Baker in the two Cheaper by the Dozen movies, Lucy Miller in two films of The Santa Clause trilogy and performed the voice of Mertle Edmonds in the Lilo & Stitch franchise.
Her father is actor Bill Mumy. Among his many roles, he appeared as Will Robinson in the Lost in Space TV series, and as a child in the 1961 The Twilight Zone episode "It's a Good Life". Liliana appeared with her father, as his child, in the revival series' 2003 sequel episode "It's Still a Good Life". She currently voices Beth Tezuka in the animated web series Bravest Warriors and Leni Loud in the Nickelodeon TV series The Loud House, and has been joined by her father on some episodes of both shows.