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Thomas Birdsey
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Thomas Birdsey

Played by Mark Ruffalo

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.

I Know This Much Is True (HBO)
About the Series

I Know This Much Is True (HBO)

A family saga that follows the parallel lives of identical twin brothers in an epic story of betrayal, sacrifice and forgiveness.

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