Margaret Challis was on her way back from a night out at the theatre when she died in a head on car crash which also killed three teenagers . A grandmother who died in a horror car crash had recently told her family she had 'everything to live for ' after receiving the all clear from a brain tumour . Margaret Challis , 66 , from Methyr Tydfil , South Wales , was on her way back from a night out at the theatre to celebrate when she was killed in a head on crash with new driver Rhodri Miller , 17 , who died along with his girlfriend Alesha O'Connor and friend Corey Price . Her heartbroken son Jason Webber , 41 , said his mother had recently told her six children and 20 grandchildren that she felt like she had 'everything to live for ' after being successfully treated for the brain tumour . He said : 'She just went out for the night and did n't come home . 'Kids were her life . She did n't go out , did n't drink , did n't smoke . She just loved her family and would cook a Sunday lunch for 17 most weekends . ' Mr Webber said he feels sorry for the families of everyone killed in the crash , which happened on a notorious winding stretch of the A470 through the Brecon Beacons National Park . He said : 'It 's tragic that one moment in a night can take away your life just like that . ' I feel sorry for the families of the others who lost their loved lives that night and are suffering like we are . ' I will miss my mother 's shy smile and having someone to turn to . ' Scroll down for video . It is the second tragedy to hit her family after two of her siblings died in the 1966 Aberfan colliery disaster . Mrs Challis witnessed the horrific incident as a 16-year-old and was just yards away when her eight-year-old brother and seven-year-old sister were tragically killed along with 116 other school children and 28 adults . A bunch of flowers were left on the side of the A470 where the crash took place on Friday night . Mrs Challis was standing at the bus stop on October 21 , 1966 waiting for her lift to school when she saw the enormous colliery slag heap which loomed above her siblings ' school collapse and destroy the classrooms . More than 40,000 cubic metres of discarded rock , shale and mud covered the village in minutes , and the classrooms at Pantglas Junior School were swallowed by the mud slide - crushing and suffocating the school children and teachers inside . Mrs Challis 's neighbour said : 'She had talked about the disaster and it still moved her to tears . 'She remembered the day vividly as does everyone caught up in the tragedy . It is so sad the way her life ended . ' Rhodri Miller ( pictured left ) had only passed his test three days before the fatal crash and was killed along with girlfriend Alesha O'Connor ( centre ) and friend Corey Price ( right ) . All were aged 17 . Friday 's tragedy happened when A-level pupil Rhodri celebrated passing his driving test three days previously by going for a cruise with friends in his green VW Golf . He was in a six-car convoy with other teenages on a dangerous mountain road when he lost control on a bend . The victims ' families paid tribute to them on Monday as friends lay flowers outside Ysgol Bro Morgannwg in Barry , the school where Rhodri and Corey were pupils . The families of the three teenagers said they were struggling to come to terms with their loss . Rhodri 's parents described their son , a season ticket holder at Cardiff City FC , as ' a bright , talented ' A-level student 'who had so much to live for ' . Alesha 's mother and father , Sharon and Paul , said : 'She was the perfect daughter and friend and has left a massive void in our family . 'Alesha was beautiful , intelligent and artistic and had her whole life ahead of her . We as a family would like to pass on our sympathy to the other families who have lost loved ones . ' Corey 's famiy added : 'The family of Corey Price are devastated by the sudden and tragic loss of their wonderful gentle and caring son , brother , uncle and grandson . 'No words can explain how we are feeling but we are truly grateful of the support of our family and friends at this tragic time . ' Seven teenage boys , aged 17 and 18 , have been arrested on suspicion of dangerous driving and bailed by police . Superintendent Chris Curtis , of Dyfed Powys Police , said : 'This is a tragic incident and our thoughts are with the families at this difficult time . 'We are working with South Wales Police in order to provide support to the families affected and also the communities they live within . We will work with partners to ensure that the incident is fully investigated . ' Mrs Challis witnessed the horrific Aberfan colliery disaster ( pictured ) in 1966 and was yards away when her eight-year-old brother and seven-year-old sister were tragically killed along with 116 other school children .
serial ##llis , 66 , was one of four to die in horror car crash on stage . Recently survived brain surgery and realised she had ' everything to live for ' Grandmother of 20 was absolutely all clear with a night out at the theatre . She was killed in head on crash with new driver and his two friends . Mrs Challis witnessed the tragic accident which killed her siblings in 1966 .