A young woman and her partner are named as two of the survivors of the M5 crash - but her sister and wheelchair-bound father both died, it has emerged.
Michael Barton, from Berkshire, and his daughter Maggie were killed in the horrific accident on Friday night after they became trapped in their burning car.
Emma Barton and her partner Christopher Burbull, who were in the same vehicle, managed to escape the wreckage.
However, reports said Emma, who is a carer at a hospice in Berkshire, is in a coma.
Both victims are being treated in hospital in the West Country.
One of Mr Burbull's close relatives said that he and his family were too upset to talk about the crash.
A neighbour on the road where the Barton family lived told how the sisters had lost there mother several years ago.
"They were very close," she said. "I think they just had each other."
The woman, who declined to be named, said the foursome had been at a funeral before they were caught up in the road tragedy.
A marked Avon and Somerset Police squad car was parked outside the Barton family home on Sunday evening.
It comes after police said investigations into the cause of the M5 crash would focus on a fireworks event that was being held at nearby Taunton Rugby Club.
Assistant Chief Constable Anthony Bangham told reporters that witnesses had reported "smoke, not fog" created "impossible" driving conditions.
Earlier, police confirmed the final death toll would remain at seven. Officers said their "worst fears" over the accident "have not been realised".
Previously there had been major concerns that the toll could rise as police recovered all 34 vehicles from the wreckage of Friday's crash.