
You don’t just give up on the people you love. The parallel lives of identical twin brothers Dominick and Thomas Birdsey unfold in an epic tale of betrayal, sacrifice and forgiveness, set against the shifting landscape of 20th‑century America, where each brother confronts his own choices and the weight of their shared history.
Does I Know This Much Is True have end credit scenes?
No!
I Know This Much Is True does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of I Know This Much Is True, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Mark Ruffalo
Dominick Birdsey / Thomas Birdsey

Kathryn Hahn
Dessa Constantine

Melissa Leo
Concettina Ipolita Tempesta 'Ma' Birdsey

Gabe Fazio
Shawn Tudesco / Dominick and Thomas Acting Double

Rob Huebel
Leo

Michael Greyeyes
Ralph Drinkwater

Rosie O'Donnell
Lisa Sheffer

Archie Panjabi
Dr. Patel

John Procaccino
Ray Birdsey
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