Monster mum Sarah Barrass murdered her two teenage sons by strangling them, it can be revealed.

Death certificates for Blake, 14 and brother Tristen, 13, show their cause of death as being "ligature strangulation".

The boys' deaths were registered three weeks after they died in hospital following an incident at a house in Sheffield, South Yorkshire, on the morning of May 24, this year.

Barrass sobbed in court last month when she, along with family member Brandon Machin, pleaded guilty to murdering Tristen and Blake.

Both also pleaded guilty to conspiracy to murder six of Barrass's children, including Tristen and Blake. 

Post-mortem examinations were carried out on the brothers - but the results were not given at the opening of an inquest into their deaths.

The brief inquest hearing at Sheffield Coroners' Court on June 5 did hear that Tristen was pronounced dead at 9.14am and Blake died 12 minutes later.

The court heard that all of the surviving children are under the age of 13.

It can also be revealed that evil Barrass made a sick 'murder boast' on Facebook just months before killing her two children.

The 34-year-old posted a chilling quote from Stephen King's Under the Dome to her Facebook page which read: 'Murder is like potato chips; You can't stop with just one'.

The sick post was one of several macabre posts about death she made over several months before the double murder.

Another picture shows a Grim Reaper with a bloodstained scythe points at you with the caption: "Coming for you...".

Tristen Barrass was just 13 when he died
Blake Barrass, 13, also died

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Judge Jeremy Richardson QC told the pair they will be sentenced on November 12 and said: "No words of mine can ever fully reflect the enormity of what you have both done.

"The crimes you have committed quite frankly speak for themselves. The murder of two children.

"The attempted murder of four children and the over-arching conspiracy to murder those children.

"I repeat, those crimes speak for themselves.

"I have little doubt that each of you will in due course be sentenced to several terms of life imprisonment.

"This may well be a case, but it's a matter for the judge, where a whole life order is imposed."

Brandon Machin, 37, will also be sentenced on November 12
Sarah Barrass, 35, has been told she faces a lengthy jail sentence

No details were given in court about what happened to the children inside the house in Sheffield.

A serious case review is to be held into the deaths of the two boys.

In May, Councillor Jackie Drayton, Sheffield City Council's cabinet member for children and families, said she was "devastated" to hear of the deaths.

She said the review would be formally commissioned by the Safeguarding Children Board.

"All partners in the city will be coming together to understand, review and reflect on exactly what happened and why," she said.

The review's findings will be made public once it has concluded, she added.

The cortege arriving at Grenoside Crematorium, Sheffield before the funeral of Tristan and Blake

Hundreds of mourners attended the funeral of the two teen brothers who were laid to rest together in one coffin last month.

Blake and Tristen's shared coffin arrived to Grenoside Crematorium in Sheffield with an enormous cortege of 300 motorcycles and two Lamborghini cars.

Friends and family say the brothers were both fanatical about fast cars and motorbikes, so local owners were asked to be part of the procession.

As the white coffin, which had the boys' names engraved on it, entered the crematorium the Ed Sheeran song Thinking Out Loud was played on loudspeakers.

It was revealed in May that Tristen appeared on a BBC programme with a yellow mohawk to raise money for a friend battling cancer.

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