Now Streaming on HBO Max

Now Streaming

Watch Now

You don't just give up on the people you love.


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.

  1. Derek Cianfrance


Series Cast

  1. Mark Ruffalo as Dominick Birdsey / Thomas Birdsey

    Mark Ruffalo

    Dominick Birdsey / Thomas Birdsey

    6 Episodes

  2. Melissa Leo as Concettina Ipolita Tempesta 'Ma' Birdsey

    Melissa Leo

    Concettina Ipolita Tempesta 'Ma' Birdsey

    6 Episodes

  3. Rosie O'Donnell as Lisa Sheffer

    Rosie O'Donnell

    Lisa Sheffer

    6 Episodes

  4. Archie Panjabi as Dr. Patel

    Archie Panjabi

    Dr. Patel

    6 Episodes

  5. Kathryn Hahn as Dessa Constantine

    Kathryn Hahn

    Dessa Constantine

    6 Episodes

  6. John Procaccino as Ray Birdsey

    John Procaccino

    Ray Birdsey

    6 Episodes

  7. Rob Huebel as Leo

    Rob Huebel


    6 Episodes

  8. Michael Greyeyes as Ralph Drinkwater

    Michael Greyeyes

    Ralph Drinkwater

    6 Episodes

  9. Gabe Fazio

    Shawn Tudesco / Dominick and Thomas Acting Double

    6 Episodes

  10. View More

Full Cast & Crew

Last Season

Miniseries - I Know This Much Is True


2020 | 6 Episodes

Season 1 of I Know This Much Is True premiered on May 9, 2020.

View All Seasons

I Know This Much Is True
I Know This Much Is True


Status Ended


  • See more TV shows from HBO...

Type Miniseries

Original Language English


Content Score


Yes! Looking good!

Top Contributors

Popularity Trend

Login to report an issue

You need to be logged in to continue. Click here to login or here to sign up.

Can't find a movie or TV show? Login to create it.


s focus the search bar
p open profile menu
esc close an open window
? open keyboard shortcut window

On media pages

b go back (or to parent when applicable)
e go to edit page

On TV season pages

(right arrow) go to next season
(left arrow) go to previous season

On TV episode pages

(right arrow) go to next episode
(left arrow) go to previous episode

On all image pages

a open add image window

On all edit pages

t open translation selector
ctrl+ s submit form

On discussion pages

n create new discussion
w toggle watching status
p toggle public/private
c toggle close/open
a open activity
r reply to discussion
l go to last reply
ctrl+ enter submit your message
(right arrow) next page
(left arrow) previous page


Want to rate or add this item to a list?