Brisbane siblings Sarah and Daniel Walker lost their lives in an instant when their car was hit head-on on the Bruce Highway as they returned home from a trip to Bundaberg.
Their mum, Kerri Walker, lost two of her kids in the prime of their lives and the same fiery crash, just as the Easter holidays were almost spent, left Sarah's 14-year-old son critically injured.
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"My two beautiful babies are gone and I can't even see them," a grief-stricken Ms Walker said through sobs.
"My grandson's fighting for life.
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"... It's the worst time of my life."
Two days on from an accident so bad it shocked senior police, Ms Walker said her family had barely had time to process the deaths of Nundah residents Sarah, 30, and Daniel, 22.
She was more concerned about her grandson, and whether he would recover after being airlifted to the Royal Brisbane and Women's Hospital's intensive care unit.
Peter Knowles, a friend of the Walker family, was also travelling in the back seat of the grey Mazda as the Walkers returned to Brisbane from their hometown of Bundaberg.
The 25-year-old's mum told News Corp he had broken both legs, fractured two vertebrae and would have to learn to walk again.
The crash happened about 3.15pm on Monday when a car carrying Hervey Bay solicitor Don Gayler and his wife Leanne was involved in a collision with another car, before spinning and colliding with the Walkers on the Bruce Highway, near Maryborough.
The cause of the initial collision, just a couple of minutes out of Tiaro, remained a mystery.
According to police, the Hervey Bay couple could have died too, if it wasn't for officers from Tiaro, who hauled the pair out of danger seconds before fuel lying on the road caught fire.
"I believe that their actions saved those people's lives," Acting Inspector Paul Algie said.
"It's probably one of the worst accidents that I've been to in my career.
"It was certainly horrendous."
Inspector Algie also praised the "life-saving" efforts of Sunshine Coast medico Ann Gillies, who was only a couple of cars back.
He did not rule out laying charges as police continued to investigate the collision.
Mr Gayler's staff at Gayler Legal declined to comment on Wednesday.
Two Brisbane residents travelling in the car that was clipped avoided serious injury and stopped down the road as the other two cars burst into flames.
They had both spoken with forensic crash detectives as they tried to piece together what happened.
Inspector Algie said forensic crash police were inspecting the car to rule out any mechanical failure and reconstructing the crash but could not say how long it would take to determine a cause.