Mr Kirk is the father of Colin Kirk and the man Paddy Kirk believed to be his father until February 2019. When Paddy and his brother were children, his quick tempered father emotionally abused him. Paddy's father was later admitted to a mental hospital and when he got out, Paddy made him a poster saying "Welcome Home Dad". His dad was over the moon and gave Paddy a hug. However, the next day, Paddy heard an engine going in the garage, with a hosepipe leading to the window, and found his father dead in the car.