A High Court judge is to investigate after a woman said her estranged Islamic husband was "negatively influencing" their 12-year-old son with "radical fundamentalist thought, which is associated with terrorism".
Mr Justice Holman said the woman - who lives in London and is English - had told how the youngster had cried and said she was "going to hell" because she was not a Muslim.
The woman had also told how her 11-year-old son had got "ideas" from his father - a Libyan who had lived in England for a long time and was a British citizen, said the judge.
She had told how both boys said they "want to be a jihadist when they grow up" and that they hated "England and Christians".
Mr Justice Holman said a local authority had begun care proceedings after the allegations were made and police were involved.
The judge stressed that all the "material" was "no more" than statements made by or attributed to the woman. He said the man "strongly denies" all of the allegations made against him.
He said he would analyse the allegations at a hearing in the Family Division of the High Court later this year before making decisions about the children's futures.
The judge said the couple were married and had seven children. Family court litigation had started after they became estranged. He said there were disputes over where children should live and what contact they should have with their father.
Detail has emerged in a written analysis of the case by the judge following a preliminary hearing in the Family Division of the High Court in London.
None of the people involved were named .
Mr Justice Holman said a local authority had issued care proceedings in relation to the couple's children earlier this month and given detail of the woman's allegations in a report. The judge said police had added a paragraph to the report.
He said the local authority report had told how the woman had described her estranged husband as "an overly controlling, Islamic fundamentalist".
And she had "expressed the fear that he was negatively influencing (the 12-year-old boy) with radical fundamentalist thought, which is associated with terrorism. She said this revolves around the superiority of Islamic thinking over any other belief and seeing non-Muslims as 'infidels'. "
The judge said the woman had also made a statement in which she told how the 12-year-old boy and his 11-year-old brother had both been "extremely hostile and rude" to her and called her a "Christian witch".
She had said the younger boy had "told me that I am evil and going to hell", and had added: "When I asked the children where they had got these ideas from, they said that their father had told them."
The woman had gone on: "(The 12-year-old boy) told me that he cannot love me because I am going to 'hell fire'. He was crying and said that I was going to hell because I am not a Muslim."
She had said the boys were "showing signs of radicalised behaviour" and had said they wanted to be "a jihadist when they grow up" and that "they hate England and Christians".
The judge said he would make decisions about whether the children should go into care after a hearing listed to take place in June. He said "all issues" would be analysed.
"I stress very strongly and clearly indeed that at the moment all of this material is no more than statements made by, or attributed to, the mother, and no more than allegations insofar as it relates to the father or any members of his family in Libya," said Mr Justice Holman.
"The father himself very strongly denies nearly all of the allegations that have been made against him."
The judge added: "I understand from his counsel... that he also very strongly denies that he has said, or done, anything to any of the children which might lead any of them to say the things or behave in the ways described by their mother."