I Know This Much Is True 

Middle-aged Dominick Birdsey recounts his troubled relationship with Thomas, his paranoid schizophrenic twin brother, and his efforts to get him released from an asylum.
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Series cast summary:
Kathryn Hahn ...  Dessa Constantine 6 episodes, 2020
Melissa Leo ...  Ma 6 episodes, 2020
Juliette Lewis ...  Nedra Frank 6 episodes, 2020
Rosie O'Donnell ...  Lisa Sheffer 6 episodes, 2020
Archie Panjabi ...  Dr. Patel 6 episodes, 2020
Imogen Poots ...  Joy Hanks 6 episodes, 2020
John Procaccino ...  Ray Birdsey 6 episodes, 2020
Mark Ruffalo ...  Dominick and Thomas Birdsey 6 episodes, 2020
Tom Stratford ...  Papa Covington 6 episodes, 2020
Donnie Masihi ...  8yo Dominick Birdsey 4 episodes, 2020
Rocco Masihi ...  8yo Thomas Birdsey 4 episodes, 2020
Simone Coppo ...  Vincenzo Tempesta 3 episodes, 2020
Matt Helm ...  Young Leo 3 episodes, 2020
Marcello Fonte ...  Domenico Tempesta 2 episodes, 2020
Michael Simon Hall ...  Robert Van Vranken / ... 2 episodes, 2020
Agatha Nowicki ...  Angie Constantine 2 episodes, 2020
Joseph Ragno ...  Henrey Rood 2 episodes, 2020
Jonathan Tabler ...  Cowboy Hat 2 episodes, 2020


Middle-aged Dominick Birdsey recounts his troubled relationship with Thomas, his paranoid schizophrenic twin brother, and his efforts to get him released from an asylum.

Plot Summary | Add Synopsis

Plot Keywords:

f rated | based on novel | See All (2) »









Release Date:

2020 (USA) See more »

Filming Locations:

Poughkeepsie, New York, USA See more »

Company Credits

Production Co:

HBO Films See more »
Show more on IMDbPro »

Technical Specs

Sound Mix:

Dolby Digital



Aspect Ratio:

See full technical specs »

Did You Know?


During filming in Wappingers Falls they changed an old Sonic food chain building into a retro McDonalds. See more »

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