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A former teacher-turned house painter, Dom is Thomas’ identical twin brother, and often placed in the role of “his brother’s keeper.”

Dominick’s identical twin brother, Thomas is a diagnosed paranoid schizophrenic, who has been in and out of mental health institutes for his adult life.

The daughter of an Italian immigrant, Concettina Ipolita Tempesta Birdsey is Dom and Thomas’ mother.

A graduate student Dominick hires to translate his grandfather’s story.

A former classmate of Dominick and Thomas’, Ralph is now the janitor at Hatch Institute.

A social worker at the Hatch Institute where Thomas is staying.

Car-dealer, want-to-be actor, and Dominick’s best friend, Leo is married to Dessa’s sister.

Seen in flashbacks, Dessa meets Dominick and Thomas when they are in college.

Cast & Characters

See the full list of cast and characters

Mark Ruffalo

Mark Ruffalo

Kathryn Hahn

Imogen Poots

Melissa Leo

Juliette Lewis

Michael Greyeyes

John Procaccino

Aisling Franciosi

Rosie Odonnell

Rob Huebel

Archie Panjabi

Aisling Franciosi

About the Series

I Know This Much Is True (HBO)