As the first evidence-based analysis of the prevention potential of fathers, Women without Borders’ (WwB) Father Study set out to determine whether men with adolescent and young adult children are a missing link in the prevention sphere. In the spirit of its longstanding ‘Men Included’ and ‘Parenting for Peace’ philosophies, WwB thus probed fathers’ perceptions of their security-related responsibilities, experiences with radicalisation, and perceived barriers to realising their prevention potential in rural and urban areas across Uganda and Zanzibar. The study not only offers insight into divergent East African security, parenting, and fatherhood contexts; what also emerges is a fuller picture of fathers’ safeguarding potential than hitherto has been attempted. The research study was conceived with real-world application in mind. The results seek thus to aid–or indeed act as a foundation for–future programmes attempting to reach vulnerable youth by harnessing the untapped soft power skills of fathers in at-risk communities, including new iterations of WwB’s ‘FatherSchools: Parenting for Peace’ Model.