ChallisMargaret Challis , 66 , was one of four to die in horror car crash on Friday . Recently survived brain tumour and said she had 'everything to live for ' Grandmother of 20 was celebrating all clear with a night out at the theatre . She was killed in head on crash with new driver and his two friends . Mrs Margaret Challis witnessed the Aberfan disaster which killed her siblings in 1966 .
Margaret Challis , 66 , was one of four to die in horror car crash on Friday . Recently survived brain tumour and said she had 'everything to live for ' Grandmother of 20 was celebrating 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 Aberfan disaster which killed her siblings in 1966 .