Colin Grimshaw was Eileen Grimshaw's father, and grandfather of Jason and Todd Grimshaw. He was briefly engaged to Rita Sullivan until it became known that he had had a fling with underage Paula Carp in 1976 and that Julie Carp was his daughter from that relationship. Colin was born on 27th April 1939. By 1961, he had married and his daughter Eileen was born on 7th October of that year. Although Colin did not spend much time parenting, preferring to drink and gamble, Eileen had many positive memories of him.