Republicans Dolours (left) and her sister Marian
Dolours passed away at her home in North Dublin in 2013 but in 1973 she was involved in the car bombing of the Old Bailey in London.
More than 200 people were injured and one of the victims died of a heart attack.
The republican was later sentenced to 20 years in prison where she went on hunger strike. Upon her release in 1980 she married Stephen.
Tonight the actor opened up about their marriage and Dolours alcholism.
He said: My father was an alcoholic and drank himself out of a job. We started moving around you know to survive.