<Tr> <Th> Nieces </Th> <Td> Lily Platt </Td> </Tr> <P> Sarah Platt (also Tilsley and Grimshaw) is a fictional character from the British ITV soap opera Coronation Street . She was born on - screen during the episode broadcast on 2 February 1987 . She was played by Leah King in 1987 and by Lynsay King from 1987 until 8 October 1999 when King opted to leave to focus on her education . Tina O'Brien took over the role on 31 October 1999; she opted to leave in 2007 and made her final on - screen appearance on 30 December 2007 . A number of false rumours about O'Brien returning to the role surfaced during her absence from the serial . In October 2014, it was announced that O'Brien was going to reprise the role, she returned to filming in February 2015 and returned on screen on 30 March 2015 . </P> <P> Sarah is the daughter of Gail (Helen Worth) and Brian Tilsley (Christopher Quinten), sister to Nick Tilsley (Warren Jackson, Adam Rickitt, Ben Price) and half - sister to David Platt (Thomas Ormson, Jack P. Shepherd), granddaughter to Audrey Roberts (Sue Nicholls), Ted Page (David Byrne) and Bert and Ivy Tilsley (Lynne Perrie) and mother to Bethany (Mia Cookson, Amy & Emily Walton, Lucy Fallon), Billy and Harry . Sarah's storylines have included a controversial and ground - breaking underage pregnancy which saw her giving birth to Bethany Platt and saw Sarah deal with motherhood in her teens, internet grooming, her friendship with Candice Stowe (Nikki Sanderson), her relationships with Todd (Bruno Langley) and Jason Grimshaw (Ryan Thomas) as well as her sibling rivalry between her and her half - brother David . Her exit storyline saw her leave Weatherfield to start a new life with Bethany in Milan . Her return storyline saw her track down Bethany who had run away from home and returned to Weatherfied . Since then Sarah's storylines have included a relationship with Callum Logan (Sean Ward), joining her brother David and sister - in - law Kylie Platt's (Paula Lane) feud with him, being forced to cover - up his murder when Kylie kills him to save her, giving birth to his son Harry, suffering from postpartum psychosis, a relationship with Gary Windass (Mikey North), being the victim of a scam by Pat Phelan (Connor McIntyre), dealing with the discovery that Bethany is a victim of sexual exploitation by her adult boyfriend Nathan Curtis (Christopher Harper), her grief when Gary is wrongly presumed dead, her anger upon learning his one - night stand with Nicola Rubinstein (Nicola Thorp) and her pregnancy, coming to terms with the fact that Bethany is a lapdancer, and rekindling her relationship with Gary . </P> <P> Sarah is born prematurely in February 1987 and questions are raised about her paternity, due to Gail's affair with Brian's cousin, Ian Latimer (Michael Loney) and Brian rejects Sarah, believing she was not his daughter; until a blood test reveals otherwise . Her birth reunited Gail and Brian after their divorce, however, Brian dies in February 1989 after being stabbed by a group of thugs . Gail then started a relationship with Martin Platt (Sean Wilson), they had David together on Christmas Day 1990 and later married . Brian's mother, Ivy Tilsley (Lynne Perrie), tried to fight against Martin adopting Nick and Sarah as their names would change from Tilsley to Platt . Despite trying to fight the adoption, Nick and Sarah were allowed to be adopted . Gail and Martin's marriage eventually broke up a decade later . </P>

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