Thomas Feargal "Tom" Hagen is a fictional character in the Godfather books and films. He was portrayed by Robert Duvall in the films. He is the informally adopted son of Don Vito Corleone, a qualified lawyer and the consigliere to the Corleone Mafia family. Mild-mannered and soft-spoken, he serves as the voice of reason within the family. The novel and first film establish that he is of German-Irish ancestry.He was found homeless at age 11 by Sonny Corleone, who took him home to see him taken in by the Corleone family. Although the Don never formally adopted Tom, thinking that this would be an act of disrespect to Hagen's parents, Hagen thought of Vito Corleone as his true father.