Farina was married to Patricia Farina from 1970 until their divorce in 1980.
They had three sons: Dennis Jr., Michael and Joseph.
His youngest son, Joseph, is also an actor.
He had two granddaughters, Brianna and Olivia, and four grandsons: Michael, Tyler, Matthew and Eric.
He lived with his longtime girlfriend Marianne Cahill in Chicago and Scottsdale, Arizona.

A lifelong Chicago Cubs fan, he played the role of a Cubs fan in a 1988 revival of the successful 1977 Organic Theater Company stage play Bleacher Bums.
 The play was written by and starred fellow Chicago actors Joe Mantegna and Dennis Franz.

Farina was arrested on May 11, 2008, for carrying a loaded .22-caliber pistol through Los Angeles International Airport security.
He was taken to the Los Angeles Police Department's Pacific Division and booked on suspicion of carrying a concealed weapon, bail being set at $25,000.
He claimed he had simply forgotten the weapon was still in his briefcase and had never intended to take it on a plane.
After police determined the weapon was unregistered, the charges were upgraded to a felony and bail was increased to $35,000.
After reaching a plea agreement with prosecutors, he pleaded no contest and was sentenced to two years' probation on July 17, 2008.
Farina was married to Patricia Farina from 1970 until their divorce in 1980. They had three sons: Dennis Jr., Michael and Joseph. His youngest son, Joseph, is also an actor. He had two granddaughters, Brianna and Olivia, and four grandsons: Michael, Tyler, Matthew and Eric. He lived with his longtime girlfriend Marianne Cahill in Chicago and Scottsdale, Arizona.
A lifelong Chicago Cubs fan, he played the role of a Cubs fan in a 1988 revival of the successful 1977 Organic Theater Company stage play Bleacher Bums.  The play was written by and starred fellow Chicago actors Joe Mantegna and Dennis Franz.
Farina was arrested on May 11, 2008, for carrying a loaded .22-caliber pistol through Los Angeles International Airport security. He was taken to the Los Angeles Police Department's Pacific Division and booked on suspicion of carrying a concealed weapon, bail being set at $25,000. He claimed he had simply forgotten the weapon was still in his briefcase and had never intended to take it on a plane. After police determined the weapon was unregistered, the charges were upgraded to a felony and bail was increased to $35,000. After reaching a plea agreement with prosecutors, he pleaded no contest and was sentenced to two years' probation on July 17, 2008.
Dennis Farina