Life With Derek Cast:
Derek Venturi: Michael Seater
Casey MacDonald: Ashley Leggat
Lizzie MacDonald: Jordan Todosey
Edwin Venturi: Daniel Magder
Nora MacDonald: Joy Tanner
George Venturi: John Ralston
Marti Venturi: Ariel Waller
The Tilmont Family:
Gerianne Tilmont: Me
Gerianne's mother, Ninette Tilmont: Natalia Tena
Gerianne's father, Derwin Tilmont: David Thewlis
Gerianne's uncle, Girvan Tilmont: Gary Oldman
Gerianne's older brother, Ryton Tilmont: Rob Morrow
Gerianne's older brother, Claude Tilmont: Christian Bale
Gerianne's older brother, Doane Tilmont: David Krumholtz
Gerianne's older brother, Jareo Tilmont: Josh Server
Gerianne's older brother, Darrick Tilmont: Drew Fuller
Gerianne's older sister, Darrick's twin Serilda Tilmont: Stephanie Beard
Gerianne's twin brother, Lindell Tilmont: Lucas Grabeel
Gerianne's younger sister, Akakia Tilmont: Alisa Besher
Gerianne's younger sister, Akakia's twin Kineta Tilmont: Keiko Yoshida
Gerianne's younger sister, Stevena Tilmont: Stefani
Germanotta AKA Lady Gaga
Gerianne's younger sister, Stevena's twin Lorena Tilmont: Lisa Folies
Gerianne's younger sister, Corabelle Tilmont: Chelsea Brummet
Gerianne's younger brother, Corabelle's twin Jarman Tilmont: Jack DeSana
Gerianne's younger brother, Kimble Tilmont: Kevin Barrette
Gerianne's younger sister, Kimble's twin Kasmira Tilmont: Kaleigh Cronin
Gerianne's younger brother, Rowson Tilmont: Rupert Grint
Gerianne's younger brother, Mayer Tilmont: Mason Musso
Gerianne's younger brother, Mayer's twin Dunley Tilmont: Daniel
Radcliffe
Gerianne's younger brother, Kenley Tilmont: Kyle Sullivan
Gerianne's younger sister, Brenna Tilmont: Brittany Curran
Gerianne's younger brother, Merrill Tilmont: Mitchel Musso
Gerianne's younger sister, Merrill's twin Edina Tilmont: Evanna Lynch
Gerianne's younger sister, Mattea Tilmont: Miley Cyrus
Gerianne's younger brother, Mattea's twin Adney Tilmont: Adam
Hicks
Gerianne's younger sister, Anora Tilmont: Ali Lohan
Gerianne's younger sister, Anora's twin Clarinda Tilmont: Christina Kirkman
Gerianne's younger brother, Lorin Tilmont: Luke Benward
Gerianne's younger brother, Lorin and Marden's twin Sydney Tilmont: Sterling Beaumon
Gerianne's younger brother, Lorin and Sydney's twin Marden Tilmont: Marc Musso
Gerianne's younger sister, Mozella Tilmont: Madison Pettis
Derek Venturi: Michael Seater
Casey MacDonald: Ashley Leggat
Lizzie MacDonald: Jordan Todosey
Edwin Venturi: Daniel Magder
Nora MacDonald: Joy Tanner
George Venturi: John Ralston
Marti Venturi: Ariel Waller
The Tilmont Family:
Gerianne Tilmont: Me
Gerianne's mother, Ninette Tilmont: Natalia Tena
Gerianne's father, Derwin Tilmont: David Thewlis
Gerianne's uncle, Girvan Tilmont: Gary Oldman
Gerianne's older brother, Ryton Tilmont: Rob Morrow
Gerianne's older brother, Claude Tilmont: Christian Bale
Gerianne's older brother, Doane Tilmont: David Krumholtz
Gerianne's older brother, Jareo Tilmont: Josh Server
Gerianne's older brother, Darrick Tilmont: Drew Fuller
Gerianne's older sister, Darrick's twin Serilda Tilmont: Stephanie Beard
Gerianne's twin brother, Lindell Tilmont: Lucas Grabeel
Gerianne's younger sister, Akakia Tilmont: Alisa Besher
Gerianne's younger sister, Akakia's twin Kineta Tilmont: Keiko Yoshida
Gerianne's younger sister, Stevena Tilmont: Stefani
Germanotta AKA Lady Gaga
Gerianne's younger sister, Stevena's twin Lorena Tilmont: Lisa Folies
Gerianne's younger sister, Corabelle Tilmont: Chelsea Brummet
Gerianne's younger brother, Corabelle's twin Jarman Tilmont: Jack DeSana
Gerianne's younger brother, Kimble Tilmont: Kevin Barrette
Gerianne's younger sister, Kimble's twin Kasmira Tilmont: Kaleigh Cronin
Gerianne's younger brother, Rowson Tilmont: Rupert Grint
Gerianne's younger brother, Mayer Tilmont: Mason Musso
Gerianne's younger brother, Mayer's twin Dunley Tilmont: Daniel
Radcliffe
Gerianne's younger brother, Kenley Tilmont: Kyle Sullivan
Gerianne's younger sister, Brenna Tilmont: Brittany Curran
Gerianne's younger brother, Merrill Tilmont: Mitchel Musso
Gerianne's younger sister, Merrill's twin Edina Tilmont: Evanna Lynch
Gerianne's younger sister, Mattea Tilmont: Miley Cyrus
Gerianne's younger brother, Mattea's twin Adney Tilmont: Adam
Hicks
Gerianne's younger sister, Anora Tilmont: Ali Lohan
Gerianne's younger sister, Anora's twin Clarinda Tilmont: Christina Kirkman
Gerianne's younger brother, Lorin Tilmont: Luke Benward
Gerianne's younger brother, Lorin and Marden's twin Sydney Tilmont: Sterling Beaumon
Gerianne's younger brother, Lorin and Sydney's twin Marden Tilmont: Marc Musso
Gerianne's younger sister, Mozella Tilmont: Madison Pettis