Mohammed Tariq's daughter, Aisha, had travelled to Syria with her husband, Siddhartha Dhar, and their five children.
Tariq, the 63-year-old shopkeeper from east London, said he was completely against the terrorist group and had pleaded with his daughter and son-in-law to drop their radical views.
"I just can't make them understand. I am very worried," he told 'The Sunday Times'.
"Omar Bakri (radical preacher) was preaching in English and that's how he caught these children... The British allowed him to speak," he said.
Dhar, who was reportedly brought up a Hindu before converting to Islam, is now believed to be a recruiter and propagandist for the ISIS.
He was one of nine men, including Choudary, arrested on suspicion of terrorism-related offences in September, 2014.
After being released on bail, the 31-year-old and his wife, then heavily pregnant, fled Britain with their four children.
He announced their arrival in Syria weeks later by posting a photo online, holding his newborn son in one hand and an assault rifle in the other.
"She is against what they have done. She tried very much for them not to go this way, to follow a good sheikh instead," he said.
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