Clarissa Mason - Colin Grimshaw

Colin Grimshaw was the father of Eileen Grimshaw and has seven other children with his former wife. He was played by Edward de Souza and made his first appearance on 12 December 2008. He was first seen being served by Peter Barlow at the bookies. As he was putting on a bet, Eileen phoned him but he said he was on the bus to Weatherfield as he was known for his betting and drinking. He stopped off at the Rover's and was attracted to Rita Sullivan. He spoke to Eileen, again lying to her about his whereabouts, but she recognised the pub owner's voice in the background. She marched across the street and handed him his cold dinner, pouring the entire salt canister on top for good measure. Colin followed her home and gave her some flowers Tyrone Dobbs had thrown away (Colin told her he'd paid for them at great expense). Eileen forgave him. Colin continued to give short strift to his daughter, lying to her on Christmas Day so he could spend the day with Rita. When Rita found out what he'd done, she apologised to Eileen, but Eileen told her it was to be expected.

On 27 April 2009, Colin celebrated his 70th birthday with his partner Rita, Eileen, his grandson Jason along with many other friends at a party in the Rovers Return, organised by Rita. During the celebrations, Colin proposed to Rita and she gladly accepted. However, the party was interrupted by the arrival of Eileen's childhood friend Paula Carp who had recently heard that her daughter Julie had slept with Jason. Paula and Julie got into an argument, with Paula urging her to stop seeing Jason. Paula then dropped the bombshell that Julie and Jason were related. When Colin tried to get her to leave the pub, Paula turned on him and revealed the shocking truth that he was Julie's father, having got her mother pregnant when she was just 14 and he was 38. This meant that Julie and Jason were aunt and nephew, while Eileen was Julie's half-sister.

On 1 May, Colin suffered a stroke while visiting Eileen, and she refused to go with him to the hospital. On 11 May, Colin discharged himself from hospital, and Jason and Julie looked after him at Eileen's. She vowed never to speak to her father again and didn't want him in the house but relented due to his frail state. The police arrived to question him over his child abuse past after Paula reported him to the police, but he collapsed and died instantly from a heart attack whilst in Eileen's living-room.