Colin Grimshaw 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 . In 1976 , Colin caught the eye of Eileen ' s best friend , flirty 14 - year - old Paula Carp . Paula seduced him and they slept together . When Colin ' s wife found out about it , she left him , although the couple did their best to protect Eileen , who did not learn the truth for many years and who thought Colin was the innocent party in the marriage break - up . Meanwhile , Paula moved away and Colin didn ' t find out that he and Paula had conceived a daughter , Julie , who was born the following year . When Eileen was an adult , Colin rarely visited his family in Weatherfield . Eileen was wary of his visits as she knew him more for his unreliability , his stubbornness and his ways with women . On one such visit in 2008 , Colin took a fancy to a bemused Rita Sullivan , and avoided Eileen so he could spend time with Rita . When Eileen found out Colin was up to his usual tricks , she marched over to the Rovers and handed him his cold dinner . Rita was receptive to Colin , giving him a reason to visit Eileen more often , although he continued to give short shrift to his daughter , lying to her on Christmas Day so that he could spend the day with Rita . Rita and Colin ' s whirlwind romance continued until April 2009 , when Colin celebrated his 70th birthday with a party in the Rovers . During the celebrations , Colin proposed to Rita and she gladly accepted . However , the party was interrupted by the arrival of Paula Carp , who had recently heard that her daughter Julie had slept with Jason . In an argument with Julie , Paula dropped the bombshell that Julie and Jason were related . Paula then told everyone that Colin was Julie ' s dad , exposing Colin as a child abuser . In the ensuing weeks , Colin was shut out by his family and , despite his best efforts , he failed to get Rita to take him back . His situation wasn ' t helped by his refusal to take the blame , with Colin continually pointing out that Paula seduced him , missing the point that as the adult it was his responsibility to put a stop to it . The stress caused Colin to suffer a stroke , but Eileen refused to go with him to Weatherfield General or visit him . On 11th May , Colin discharged himself from the hospital , with Jason and Julie , who had become obsessed with the dad she never had , looking after him at Eileen ' s house . Eileen had only let him stay there because she didn ' t want him to have to go to a nursing home . When Paula found out that Colin was staying at No . 11 , she mistakenly assumed that Eileen had forgiven him , and in her anger told the police about what Colin did to her . When the police arrived to question him over his child abuse , the thought of going to prison preoccupying him , Colin collapsed and died instantly from another stroke . List of appearances . 2008 2009