Family Ties to Terror: 9/11, Boston, Paris Attacks

Radicalization is increasingly happening within families, making it more difficult for authorities to detect, according to experts. While sibling-to-sibling radicalization is more common, cases exist where one family member influences another towards extremist ideologies.

Family Radicalization and the Challenges for Intelligence

Laurence Bindner, a specialist in online extremism and co-founder of the JOS Project, noted that “horizontal radicalisations” between siblings are more frequent than “vertical” ones involving parents and children. However, she highlighted the case of Christine Riviere, known as “Granny Jihad,” who traveled to Syria multiple times to support her son, Tyler Vilus, a fighter with Isis in the early 2010s.

Bindner described this as an “upward radicalisation” where the son progressively influenced his mother. In the recent Bondi Beach case, the extent of familial influence remains unknown, but authorities believe the son was connected to an Isis-linked network.

Jihadist structures are becoming smaller, consisting of “very restricted groups of two or three individuals, even lone actors,” according to Rodde. This “atomised” and “less organised” nature of the threat allows for rapid radicalization, but also makes it “harder to work on because the structures are less readable,” one Western intelligence source said.

Intelligence agencies have traditionally monitored potential recruiting grounds like mosques, bookstores, neighborhoods, and online platforms. However, radicalization within a family presents unique challenges, according to Mohammed Hafez, a specialist in Islamist movements at the Naval Postgraduate University.

“The conversations are private,” Hafez explained. “They don’t need to get on Telegram, on WhatsApp or other platforms that can be observed.” He added that once radicalization occurs within the home, it’s difficult to counter. “You are trapped…There’s no walking away from that. There’s no countervailing voices because you’re trapped in that relationship.”

Hafez suggests individuals may align with a family member’s views not out of ideological conviction, but to preserve the relationship. “I suspect a lot of people will go along…because they value the relationship.”