A British teenager who joined ISIS in 2015 says she wants to return home.
A statement from the family, shared by their lawyer, Mohammed T Akunjee, said they are hoping to challenge the decision.
Please find enclosed papers that relate to a decision taken by the Home Secretary to deprive your daughter, Shamima Begum, of her British citizenship.
However, in an apparent reference to the time members of her family appeared before MPs on the Home Affairs Select Committee in March 2015, she said they were told: "I won't be charged with terrorism or anything".
Mr Javid's decision will nearly certainly face legal scrutiny, as the United Kingdom is presently unable to render citizens born in the country stateless, and the revocation of citizenship is usually used against those with dual citizenship, or who became naturalised British citizens.
But after the caliphate crumbled, she has indicated her wish to return to the United Kingdom for the sake of her newly born child.
The Home Office has declined to comment further on the letter. My message is clear - if you have supported terrorist organisations overseas I will not hesitate to prevent your return. But to kill people like women and children just like the women and children in Baghuz who are being killed right now unjustly by the bombings - it's a two-way thing really because women and children are being killed back in the Islamic State right now.
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She said she feared she will never see her husband, the Dutch jihadist Yago Riedijk again, whom she still loved "very much".
"What we can say is right now ... she doesn't show any remorse or regret and isn't fazed by decapitated heads and bombs all around her, because she thought that was a normal life".
Anthony Loyd, The Times correspondent who found Ms Begum, said she was a "15-year-old schoolgirl who made a bad mistake... and we must do our best to rehabilitate her amongst our own people".
Sajid Javid stands accused of "playing politics" after IS teen Shamima Begum was stripped of her British citizenship.
Justice Secretary David Gauke said there were national security risks to allowing people such as Ms Begum to return to Britain but did not rule it out.
She also said the United Kingdom authorities had no evidence of her "doing anything dangerous", in response to concerns she could pose a security threat.
"People who went out there as amateurs are now professionals-terrorists or professional supporters of terrorism- and we have to make sure we mitigate that threat should they come back", he said.
The demand came as he prepared to declare the end of the group's so-called "caliphate", with US-led Arab and Kurdish forces close to capturing its last territorial holdout in Syria, ahead of a pull-out of American troops.