Hannigan an haife shi ne a Washington, DC, ɗayan ɗa na Emilie (Posner) Haas, wakilin dillalai, da Alan Hannigan, direban motar Teamsters. Mahaifinta dan asalin Irish ne kuma mahaifiyarta Bayahude ce. Tambaya: Menene asalin mahaifin Hannigan?
Yaren mutanen Ireland