'It's definitely him'

• Child in video has been confirmed as young son of Grace 'Khadijah' Dare
• In 2014, Dare posted a shocking photograph to her Twitter account of her then four-year-old son Isa, meaning 'Jesus', holding an AK-47 rifle  
• See full news coverage on ISIS at www.dailymail.co.uk/isis 

The child soldier who has threatened the UK with new atrocities in a chilling ISIS execution video is the son of a notorious jihadi bride from London, according to her own father.

The young boy, dressed in military fatigues and a black bandanna bearing the white mark of ISIS, declares that 'We will kill kuffar [non believers]' in depraved new footage which sees five shackled men in orange jumpsuits brutally murdered by a masked executioner.

The six-year-old boy's own grandfather has now confirmed he is the son of Grace 'Khadijah' Dare, who grew up in Lewisham, south London, to Nigerian Christian parents and converted to Islam as a teenager.

Her father Henry Dare, also known as Sunday, has said that his grandson is 'definitely' the boy in the ISIS video. 

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The child soldier who has threatened the UK with new atrocities in a chilling ISIS execution video is believed to be the son of notorious Jihadi bride Grace 'Khadijah' Dare

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In 2014, Dare posted a shocking photograph to her Twitter account of her then four-year-old son Isa, meaning 'Jesus', holding an AK-47 rifle. He bears a remarkable similarity to the child in the latest propaganda video

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Another picture of a youngster posing with a toy gun in front of an ISIS flag in 2014 and thought to be Dare's son, also bears a similarity to the child. It was tweeted by Londoner Umm Khattab, the teenaged widow of an ISIS fighter with the caption: 'Next generation, Bi'ithnillah (God willing)' 

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Her father Henry Dare told Channel 4 News that his grandson is 'definitely' the boy in the sick ISIS video. Mr Dare, who is also known as Sunday, has begged his daughter to return to Britain

Mr Dare, a minicab driver, told the Telegraph: 'I was surprised when I saw the picture. It's definitely him. Of course I'm worried but there's nothing I can do now.

'I'm not angry - I would never have expected it. I just hope someone is trying to bring them back.'

In an interview with Channel 4 news, Mr Dare, who is also known as Sunday, begged his daughter to return to Britain. He said: 'She should come back and face the music. Because, she has let herself down,'

When asked about his grandson Isa, Mr Dare said: 'He doesn't know anything. He's a small boy.They are just using him as a shield.' Mr Dare revealed that he had not spoken to his daughter for 'weeks'.

'When she calls me I keep on ignoring her calls because she has brought shame to my family and to herself,' Mr Dare told Channel 4 News.

In 2014, Khadijah Dare, one of her many post-conversion pseudonyms, posted a shocking photograph to her Twitter account of her then four-year-old son Isa, meaning 'Jesus', smiling as he aims an AK-47 rifle. 

She is married to a Swedish Islamic fighter called Abu Bakr, and is a convert who previously attended a mosque in South London.

Isa also has at least one younger sibling, a boy who would now be between two and three years old, who his mother has referred to as a 'mini mujahid', or holy warrior.

A strikingly similar appearance between Isa and the young boy in the video sparked speculation earlier today. Many pointed to a distinctive facial mole and said both had the same shaped eyes.   

Images of Isa look remarkably similar to those of the young boy featured in the video. Dare's father Henry Dare has now confirmed that his grandson is the boy in the ISIS video

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Dare is married to a Swedish Islamic fighter called Abu Bakr,  and is reported to be a convert who previously attended a mosque in South London. The couple are pictured with their child in a Channel 4 report in 2013 

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In the same footage she urges other Muslims to 'stop being so selfish...focusing on your families or studies' and implores them to join her in Syria and join the holy war

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The footage shows Dare and another veiled woman going about daily life in Syria. She told reporters she can use a Kalashnikov and would like to fight, but has had to settle for the life of a jihadi's wife

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Two years ago, Dare swapped her 'comfortable life' in Britain, where she was known for her dimples and her love of her mother's home cooking, for the horror of Syria, where she has joined the terror group ISIS

BABES IN ARMS: THE YOUNG BRITISH MOTHER VOWING TO BE THE FIRST WOMAN TO KILL WESTERNERS AND HER AK-47 WIELDING TODDLER SON 

Two years ago, Grace 'Khadijah' Dare swapped her 'comfortable life' in Britain, where she was known for her dimples and her love of her mother's home cooking, for the horror of Syria, where she joined the terror group ISIS. 

Friends have previously described Dare, from Lewisham, South London, as a bit of a tomboy who enjoyed wearing tight jeans and platforms. She also had braces and dimples and 'was very cute'.

Dare liked to watch football on TV as a child, and loved Chinese food and her mother's home cooking.

When she was older she went to a local college to study media studies, film studies, psychology and sociology, and was a popular young girl.

But it was at the age of 18, that she converted to Islam and began worshipping at the Lewisham Islamic Centre – which has links to both the Woolwich killers of Lee Rigby and radical cleric Abu Hamza.

She admitted in a Channel 4 report in 2013 that when she began wearing the full face veil in Lewisham people on the street told her to 'go back to her country', to which she replied: 'I was born round the corner'.

In the same footage she urges other Muslims to 'stop being so selfish...focusing on your families or studies' and implores them to join her in Syria and join the holy war. 

Hours after the beheading of American journalist James Foley at the hands of a British jihadist, Dare gloated on social media at his execution and vowed that she would be the first British woman to kill a US soldier.

Dare was gleeful that the 'UK must be shaking up' after the execution and from her home in the Syrian scrub she tweeted: 'Any links 4 da execution of da journalist plz. Allahu Akbar. UK must b shaking up haha. I wna b da 1st UK woman 2 kill a UK or US terorrist!'

Dare is believed to have been radicalised online before she started attending the Lewisham Islamic Centre, where Drummer Lee Rigby's murderers are said to have worshipped, although the mosque denies they were part of the congregation.

Prime Minister David Cameron has described the video as 'desperate stuff' from a group that is 'losing territory' and 'increasingly losing anybody's sympathy'.

Young children have appeared in many IS propaganda videos, including material which shows groups of children being trained with guns. 

In one infamous image, a child was pictured holding a severed head, while another photograph that circulated online showed a young child being encouraged to kick a severed head.

More than 30 UK children had been made the subject of family court orders over radicalisation fears, Scotland Yard said in August. At that time, judges had considered cases involving 12 different families. 

After appearing in an ISIS recruitment video calling on British Muslims to 'stop being selfish' and give up their families and studies to join the front line in the Middle East, Dare - a pseudonym - is said to be top of MI6's list.

In the latest sick video, the five captives were forced to confess to their crimes - most probably under duress - before they were paraded to a remote desert location and ordered to kneel. 

A jihadi speaking with an English accent yelled 'Allahu Akbar' before he and four other fanatics shot the men from point blank range. 

Jihadi Junior seen after ISIS execute five British spies

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In the 10 minute long propaganda video, one executioner (pictured) described the Prime Minister as an 'imbecile', adding: 'Your children will pay for your deeds'

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The terror group's captives (pictured), dressed in orange jumpsuits, were filmed 'confessing' in Arabic to spying for British security service

ISIS 'will be defeated': Cameron reacts to gruesome video

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Speculation mounted today that the gunman could be Siddhartha Dhar, a British jihadi who fled to join the terror group in Syria while on police bail for encouraging terrorism in 2014.

His sister, Konika Dhar, admitted the voice sounded 'a bit like' her brother, but did not believe it was him. She added she would 'kill him myself' if his identity was confirmed. 

The video ended with a trailer for another execution in which Isa warned Britain of coming atrocities.

It raised fears that he may have been made to execute someone on camera.

UNMASKING THE NEW 'JIHADI JOHN': EXPERTS STUDY VOICE AND HANDS

Intelligence analysts are expected to employ the same techniques used to successfully unmask and track down Emwazi, including voice analysis and possibly even vein-recognition technology that mapped the executioner's hands. 

They will also be hunting for clues to confirm the identity of the young English-speaking boy who also appears in the video.

The killer in the latest video is most likely be of southeast Asian origin, born in the UK, and from southern England, according to a leading forensic analyst.

The voice analyst told The Times that he was likely to have been badly educated due to his stilted style and that fact that his words were spoken as though he were reading from a script.

Before killing the prisoners in cold blood, the British jihadi said: 'This is a message to David Cameron, slave of the White House, mule of the Jews.'

He called the Prime Minister an 'imbecile' and warned 'your children will pay' for British airstrikes on ISIS targets in Syria.

He added: 'How strange it is that we find ourselves today hearing an insignificant leader like you challenge the might of the Islamic State. 

'How strange it is that the leader of a small island threatens us with a handful of planes. 

'One would have thought you would have learned the lessons of your pathetic master in Washington and his failed campaign against Islamic State.

'It seems that you, just like your predecessors [Tony] Blair and [Gordon] Brown, are just as arrogant and foolish. 

'David, only a fool would wage war against a land where the law of Allah reigns supreme and where the people live under the justice and security of the Sharia. 

'As for those of you who wish to continue fighting under the banner of Cameron on the minimum wage, we say to you, to ask yourself, do you really think your government will care about you when you come into our hands?

'Or will they abandon you, as they have abandoned these spies, and those who came before them.' 

The latest video has been hailed by military experts as a desperate move by ISIS to divert attention away from military failures in Iraq, since the terror group lost control of its stronghold of Ramadi. 

Reacting to the video, Labour MP Sadiq Khan wrote on Twitter: 'The evil and disgusting ISIS propaganda video shows why we need to do much more to tackle radicalisation in Britain.' 

A Foreign Office spokesman said: 'We are aware of the video and are examining its content.'  

THE BRITISH FAMILIES SETTING UP HOME IN THE HEART OF A WAR ZONE 

There have been a series of high-profile cases involving families taking their children to Syria, or making unsuccessful attempts to make the journey, in the past year.

In October, police released images of a family of seven from Bradford thought to have begun a journey to Syria or Iraq.

Imran Ameen, 39, his wife, Farzana Ameen, 40, and their five children - Isma Imran 15; Moeen Imran, 14; Mohammed Muneeb Imran, 11; Ismail Imran, eight; and Mohammed Imran, five - were last seen on October 5 after buying one-way tickets. Mr Ameen's brother Rehan Noor-Ul-Ameen, 30, was thought to have travelled to Turkey months earlier.

Arshid Siddique, first cousin of both Imran and Farzana Ameen, denounced the family's decision and said it 'beggared belief' that any parent would want to take their children to a war zone.

In July, a family of 12 from Luton was reported missing after failing to return from a holiday in Bangladesh. The grandparents of the group, which included 75-year-old Muhammed Abdul Mannan, were being held against their will, their son Shalim Hussain claimed.

Mr Mannan and his wife Minera Khatun, 53, went missing with their daughter Rajia Khanom, 21, and sons Mohammed Zayd Hussain, 25, Mohammed Toufique Hussain, 19, Mohammed Abil Kashem Saker, 31, and Mohammed Saleh Hussain, 26.

Three unnamed children aged between one and 11 were with the group, as were Mohammed Abil Kashem Saker's wife Sheida Khanam, 27, and Mohammed Saleh Hussain's wife Roshanara Begum, 24.

Just a month earlier British sisters Khadija Dawood, 30, Sugra Dawood, 34, and Zohra Dawood, 33, and their nine children, aged between three and 15, were feared to have travelled to link up with IS militants.

The sisters split into two groups to cross into Syria from Turkey, according to an IS smuggler.

Police also thwarted the attempts of many who were alleged to have been trying to get to the war-torn region.

In September, 33-year-old Zahera Tariq was arrested at Luton Airport on suspicion of child abduction. Her children, aged between four and 12, were taken into police protection.

Another British-born mother of two tried to take her children to the capital of so-called Islamic State territory to live under sharia law, a court heard in December. The 34-year-old lied to her husband, telling him she was taking the children to a birthday party before making her way to Heathrow, allegedly bound for Raqqa in Syria.

Four British jihadis were the subject of international sanctions in November, which banned travel and froze their assets globally.

In October, it was disclosed the number of terrorism suspects being arrested in the UK had reached record levels, with women increasingly under suspicion and at risk of radicalisation.