The newspaper report says the two women headed to Syria from London in 2013 after marrying into a six-man cell of ISIS recruits with close links to the filmed murders of western hostages by British Arab ISIS fighter Mohammed Emwazi, dubbed "Jihadi John" for his United Kingdom connection.
Begum surfaced in a Syrian refugee camp following her escape from the collapsing ISIS "caliphate" and has pleaded to be allowed to return.
"Shamima knew when she made the decision to join Daesh, she was going into a country where there was no embassy, there was no consular assistance, and I'm afraid those decisions, terrible though it is, they do have consequences", he said.
According to the Lad Bible report, the British authorities have alleged that the two sisters - aged 30 and 28, have parents who are from Pakistan and they could be eligible for citizenship there.
At one point, she told the BBC that although she was unhappy that innocent people had been killed, she thought the 2017 bombing of an arena in Manchester was "fair justification" in response to coalition airstrikes that have killed women and children in Syria.
The two sisters' citizenship battle comes in the wake of the Shamima Begum case.
Begum, 19, who was stripped of her citizenship by the British government despite her wish to return, gave birth last month in a refugee camp in northeastern Syria.
The husbands of the Iqbal sisters were reportedly killed in fighting.
Camera IconCCTV of Shamima Begum leaving at Gatwick Airport
Mr Javid revoked her British citizenship when the teenager asked to return. Upon hearing the news, UK Shadow Home Secretary Diane Abbott slammed Sajid Javid for behaving "shamefully", saying that he was responsible for the boy's death.
Dal Babu, a former Metropolitan Police chief superintendent and friend of Ms Begum's family, told BBC Newsnight: "We've failed, as a country, to safeguard the child".
Begum, from Bethnal Green, east London, was 15 when she and two other schoolgirls went to join Isis in February 2015.
Former director of public prosecutions Lord Macdonald accused Mr Javid of "moral cowardice" and said his move risked creating a "more unsafe world where stateless individuals roam with no allegiance and the death of unprotected innocents, in this case a vulnerable British baby".
For them the death of baby Jarrah is a tragedy.
"It is against global law to make someone stateless". Her family announced the boy's birth and said they believed he was "in good health".
"The security services came to speak to me and I was honest", she told the newspaper.
"Losing my children the way I lost them, I don't want to lose this baby as well and this is really not a place to raise children, this camp".