I Know This Much Is True - Season 1 - Episode 1
After paranoid schizophrenic Thomas Birdsey has a violent public breakdown, Dominick Birdsey finds himself stepping up to defend his identical twin brother in unexpected ways. As he navigates the fallout, Dominick reflects on their childhood growing up under the tyrannical rule of their volatile stepfather, Ray, and their desire to know the identity of their biological father.
About I Know This Much Is True

Title: I Know This Much Is True
First Air Date: 2020-05-09
Last Air Date: 2020-06-13
Status: Ended
Rating: 7.6/10 (from 229 votes)
Language: EN
Seasons: 1
Total Episodes: 6
Network: HBO
Genres: Drama
Production Companies: FilmNation Entertainment, Hunting Lane Films, Willi Hill
Synopsis
The parallel lives of identical twin brothers Dominick and Thomas Birdsey in an epic story of betrayal, sacrifice and forgiveness set against the backdrop of 20th century America.
Cast

Mark Ruffalo
Dominick Birdsey / Thomas Birdsey

Melissa Leo
Concettina Ipolita Tempesta 'Ma' Birdsey

Rosie O'Donnell
Lisa Sheffer

Archie Panjabi
Dr. Patel

Kathryn Hahn
Dessa Constantine

John Procaccino
Ray Birdsey

Rob Huebel
Leo

Michael Greyeyes
Ralph Drinkwater

Gabe Fazio
Shawn Tudesco / Dominick and Thomas Acting Double