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Here's a summary the key points from today's sentencing hearing at Sheffield Crown Court:

• The boy, 13, was sentenced to two years in youth custody of which he will have to serve at least half before he will be released on licence
• He was also made subject to a six-year driving ban
• He did not receive a separate sentence for the charge of possession of a bladed article, to which he pleaded guilty in October
• During a police interview, the teenager said he had never intended to harm Mrs Grant and had hoped it would be accepted that her death had been “a tragic accident”
• The teenager did not react or show any emotion for the duration of Wednesday’s hearing
• The court heard how the defendant’s life had been “routinely unstable” but that he was now “thriving” in youth detention
• Mrs Grant’s family said they would “never forgive him”

Image source, PA Media

This is what we know happened leading up to Mrs Grant's death:

• The court heard the defendant, a foster child, had been placed in Mrs Grant’s care just a few days before her death
• On 5 April, the defendant stole a kitchen knife and car keys and crept outside, intending to drive off in Mrs Grant’s car
• Mrs Grant, however, noticed the attempted car theft and ran behind the vehicle to prevent the defendant from driving off
• Mrs Grant was knocked to the ground when the vehicle reversed, causing her to hit her head
• The car then reversed again, causing catastrophic injuries to Mrs Grant
• She was pronounced dead at the scene at 19:30 BST

Marcia Grant's family have criticised the Crown Prosecution Service (CPS) over its decision to drop a murder charge against the boy and accept his guilty plea to causing death by dangerous driving.

"The last eight months has been torture, our anguish only to be compounded by the reduction in criminal charges brought against the defendant charged with the death of our mother," the family said in a statement.

"We feel completely let down by the CPS and their lack of willingness to allow our mum’s story to be heard and brought to meaningful justice.

"We strongly believe that the evidence on hand shows a complete disregard for human life and clear premeditation to do serious harm."

However, the judge Mrs Justice May, told the boy in court "the offence you committed was serious but it was not murder," adding that it was a "very bad accident".

The family added: "Our mother was killed on her own driveway by a young person wearing a balaclava, carrying a stolen knife, and in the act of stealing her car when he ran her over not once, but twice."

They said they also believed decisions made by Rotherham council played "a critical role in the circumstances which led to our mum's death".

"This whole ordeal leaves us with so many unanswered questions and we are completely heartbroken that our mother will not get the justice she deserves."

Det Ch Insp Andrea Bowell, who was the senior investigating officer on the case, said: "Although the criminal justice process has concluded today, I am aware that this brings no resolution or closure for Marcia’s family.

"They will continue to grieve their tremendous loss, and will do so for the rest of their lives.

Image source, Family handout

"Since Marcia’s death, our thoughts have been with her family and friends after she was taken from them in the most difficult of circumstances.

"Marcia was a wife, mother, grandmother, sister, friend and a pillar of her community. Her death has had a profound effect on everyone who loved her.

“Losing someone so dearly loved at the hands of another is unbearable and our condolences remain with them at this incredibly difficult time. We ask that their privacy is respected.”

The court heard Mrs Grant had been a foster carer since 2016 and the defendant had been staying with her for several days at the time of her death.

Prosecutor Mark McKone KC said the boy "claimed to have been a gangster since aged nine" and had a number of disagreements with Mrs Grant's husband Delroy, including one about him watching "inappropriate television".

The court heard that on the night of Mrs Grant's death the boy took car keys and a knife from the kitchen, crept out to the car and tried to drive it away.

Image source, Oli Constable/BBC

Mr Grant told police his wife shouted: "Someone's taking the car," but believed she did not realise it was the defendant at first.

Mrs Grant ran out to try to stop the thief and went to the back of the car before the defendant reversed the vehicle, knocking her over.

After making representations with other media in court, the BBC can now report that the boy at the centre of proceedings was in the care of Marcia Grant as a foster child at the time of her death.

Emma Glasbey
Journalist, BBC Look North

Marcia Grant’s son and daughter held hands in the courtroom as the 13-year-old boy was sentenced to two years in youth custody.

Marcia’s daughter Gemma had wiped away tears as she stood up to tell the judge that her mother was the family’s “rock” and “wanted to pull the world into a hug”.

The boy, dressed in a black suit and tie, looked ahead at the courtroom and occasionally looked down as the family statements were read.

The judge described how Mrs Grant was a committed foster carer who she said was the "shining lodestar" of her family.

Image source, Handout

"The family ought to be commended for their dignity and strength," she said.

"The impact has been devastating, no sentence could compensate for her loss or reflect her value to her family or community.

"She was a committed foster carer who dedicated herself to making disadvantaged children's lives better."

The boy, who is now 13, is also made subject to a driving ban.

He will be disqualified for six years and the judge tells him: "You must also take a special driving test before you can ever drive again."

The judge continues: "The offence you committed is very serious but it is not murder, you did not mean to kill or hurt her, it was a very bad accident."

Judge May said: "Custody is the last resort for a child - but causing her death was so serious that it must be custody."

The defendant has been sentenced to two years in custody for causing the death of Marcia Grant by dangerous driving.

The judge has returned to the court and the defendant is back in the dock.

The judge at today's hearing is 62-year-old Mrs Justice Juliet May, who has been involved in high-profile cases, including the sentencing at the Old Bailey in March of Sarah Everard's murderer Wayne Couzens for indecent exposure.

Image source, Avalon

She was educated at Wadham College, Oxford and called to the bar at Middle Temple in 1988.

She was appointed Queen's Counsel and a Circuit Judge in 2008.

This morning's sentencing hearing at Sheffield Crown Court has heard:

• Prosecutor Mark McKone KC said the boy was arrested close to the scene of Marcia Grant's death after trying to flee police
• Richard Wright KC, defending, urged the judge not to impose a custodial sentence because it would harm the child's welfare
• Marcia Grant's daughter said her mother had been the "rock" of the family and her father had been left with severe mental health problems
• Her son Shaun told the court: 'I've had my best friend ripped away from me with no chance to say goodbye"

After hearing all submissions the judge, the Honourable Mrs Justice Juliet May, has retired until 12:30 GMT.

Richard Wright, defending, goes on to describe the boy as "an extremely challenging child".

"I would invite the court to consider that the defendant is extremely sorry for what he did," he adds.

"When he said 'Is she dead?' that wasn’t a flippant comment."

"It followed immediately when the police officer arrested him... and informed him of Marcia’s death."

Defence barrister Richard Wright KC says although the case reaches the threshold for custody the boy's "welfare would be best served automatically by a non-custodial sentence" .

"The short history of his remand could be encapsulated by the word 'thriving' in the sense that he is engaging with education, his behaviour is good to excellent," Mr Wright adds.

"It’s been expressed to me that a secure environment and the structure it provides has demonstrated potential that structure could have on his life.

"He’s just started Year 9, my view is that is a crucial stage of education."

Marcia Grant's son Shaun now gives his victim impact statement to the court.

"Since this day our lives have been turned upside down," he says.

"How someone had such disregard for human life.

"I’ve had my best friend ripped away from me, with no chance to say goodbye, with no chance to tell her how amazing she was as a friend, Mum and foster carer.

"Never again will my phone ring and I will see the word Mum.

"Whilst my pain is often unbearable, my dad has been left traumatised, confused and in a constant state of grief."