Susan Carpenter

Naomi Watts

Peter Carpenter

Jacob Tremblay

Henry Carpenter

Jaeden Lieberher

Sheila

Sarah Silverman

Dr. David Daniels

Lee Pace

Christina Sickleman

Maddie Ziegler

Glenn Sickleman

Dean Norris

Principal Wilder

Tonya Pinkins

John

Bobby Moynihan

Tommy

Maxwell Simkins

Mrs. Evans

Geraldine Hughes

Morris

Jackson Nicoll

Nurse Kathy

Marjan Neshat

Big Ed

Joel Garland

Gary

Wass Stevens

Nurse Leah

Donnetta Lavinia Grays

Gus

Arthur French

Dot

Mary Joy

Trucker

Mike Massimino

Teenage Girl Customer

Zandi Holup

EMT

Deborah Rayne

Bookstore Clerk

Donna Mitchell

Talent Show Singer

Taylor Dior

George Sickleman

Philip Smreck

Cop

Peter Hourihan

Stage Manager (uncredited)

Lily Peterson

Kid with "R"

Gavin Barnes

Girlfriend (uncredited)

Stefanie Flores

Boy (uncredited)

Logan Smith

Parent

Sergei Ashurov

Letter Kid

Joshua Black