BRITISH jihadi fighter Jack Letts married into a “top" ISIS family in northern Iraq, it has been claimed.

The Oxford-born Muslim convert, 24, fled the comfort of his middle class upbringing and joined the depraved terror group in Syria in 2014.

5 Jack Letts, pictured in 2015 with Mosul Dam in the background, married into a 'top' ISIS family, it has been claimed

It has been reported that Letts married the daughter of an Iraqi tribal leader, who he has a son with, before he was captured in northern Syria in 2017.

Former British soldier Alan Duncan, who fought ISIS alongside the Kurds, told Sun Online that Letts “definitely” married into a high-ranking family within the death cult.

That’s according to sources that Duncan has spoken to on the ground in Iraq and Syria.

Mr Duncan, who has spent the last two years interviewing jailed jihadis for an upcoming documentary, said Letts has been downplaying his status within ISIS.

Jack is clearly higher within ISIS than he has admitted to Ex-British soldier Alan Duncan

He said: “He definitely married into a top ISIS Iraqi family and that explains why he was down in Mosul.

“The tribal leaders are what you would call Imans - as soon as a tribal leader gives his allegiance to ISIS he becomes an Emir. They basically become a leader in ISIS.

“Letts married into that family.”

One terror expert, who has spoken directly to Lett's parents in the past, told Sun Online he heard similar stories about the extremist's new family but cautioned that details of his life in the caliphate are hard to verify.

5 Jack Letts, dubbed Jihadi Jack, fled to Syria in 2014 and reportedly married the daughter of an Iraqi tribal leader the following year

Sun Online has approached the terrorist’s parents John Letts and Sally Lane for a response to the claims.

Mr Duncan, a former soldier in the British army, also questions how the young terrorist – who was pictured near Mosul Dam in 2015 - ended up in northern Iraq without being a connected militant.

Letts travelled to Kuwait in 2014 after telling his parents he wanted to improve his Arabic before he made his way to war-torn Syria.

He said: “How did Letts get from Syria to Iraq and then marry into an Iraqi family?

BRAINWASHED EXTREMIST

“A lot of the westerners who married over there married other Europeans.

“Jack is clearly higher within ISIS than he has admitted to.

“You don't marry into a family like that and get a wife like that if you're nothing.”

The extremist’s parents were spared jail in June and handed a suspended sentence after being found guilty of funding terrorism when they attempted to send their son £223.

Footage shot by CBS shows 'Jihadi Jack' lying on the floor of a crowded cell at a Kurdish prison in northern Syria Credit: CBS This Morning

5 John Letts and Sally Lane sent money to their son in Syria - but were spared jail in June

Who is Jack Letts? Jack Letts, 24, was born in Oxford and attended Cherwell School.

He fled to Syria in 2014 when he was 18 having converted to Islam two years earlier and studying Arabic so he could read the Koran.

In Syria, Jack reportedly changed his name to Abu Mohammed and in 2015 married an Iraqi woman with whom he has a son, Muhammed.

He was captured in 2017 and told the BBC that he had considered carrying out a suicide attack.

Letts said sick ISIS militants would "encourage" members in an "indirect way" to put on a suicide vest, adding: "I used to want to at one point, believe it or not.”

He continued: "Not a vest. I wanted to do it in a car. I said if there's a chance, I will do it.”

Letts is thought to have been captured by the Kurdish YPG militia after trying to escape from the Battle of Raqqa.

He is currently in a Kurdish-run jail in northern Syria and insists he regrets joining ISIS calling the decision a "big mistake."

In court, it emerged that Sally had spoken to her son’s new wife Asmaa over the phone on one occasion.

The mum-of-two said: "They seemed to have quite a nice relationship, as well, he seemed to be sort of teasing her, the way he way he was with his girlfriends back home.

"Asmaa was with him in that conversation also. I spoke to her as well, he passed over the phone and he would translate. So, the phone was going back and forth."

Letts, who claims he never killed anyone while fighting for the murderous cult, is said to have never met his young son named Mohammad.

It is unknown where Asmaa and the child are - and if they are even still alive.

Self-confessed “enemy of Britain” Letts - who once threatened to cut off an old schoolmate's head in a sick Facebook post - is currently rotting in a Kurdish jail in Syria after being stripped of his UK citizenship.

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His parents had appealed to Canada for help in repatriating him – due to his father being born in Ontario.

But, opposition from conservative politicians resulted in the Trudeau administration saying they had “no obligation” and “no intention” of helping Letts while accusing the UK of trying to “off load” its responsibilities.

In an interview in prison, Letts told the BBC: "I know I was definitely an enemy of Britain.

“I did what I did. I made a big mistake, and that’s what happened.”

Interview with Jihadi Jack who converted to Islam aged 16, first travelled to Syria in 2014

5 Jack told his parents he wanted to learn Arabic when he left the UK in 2014