The present study examines baptism godparenthood, the Italian spiritual kinship system (known as comparatico) among people originating from rural areas of Calabria, southern Italy, who migrated to Adelaide, South Australia, in the 1950s and 1960s. The study specifi cally investigates the transmission of norms and the widespread observance of duties associated with the practice of comparatico among participants. Social relations among allied families produce social capital by generating high levels of obligations and expectations. Participants have maintained and reinforced spiritual kinship with non-kin, often originating from the same Calabrian village. The study reveals how the comparatico system evolves into an extended network infl uencing everyday practices. Non-consanguineous informants, after becoming compari (family allies), are bound by obligations and/or privileges involving both their private and socioeconomic lives.