This article addresses an internal conflict that arose in an Amazonian village when it adopted an officially recognised quilombola identity. It argues that this issue, which tends to be interpreted in terms of identity, is in fact primarily social. Indeed, the divergent positions adopted by different groups of relatives need to be examined in relation to the dynamics of socio-economic differentiation linked to family histories. The article shows that the conflict related back to power struggles between dominant groups of relatives and that the questions about the limits of the group reflected preoccupations concerning who held legitimate authority to make decisions about the future of the village. By analysing some of the assumptions of the current debate about multiculturalism and ethnicity in Amazonia, this article contributes to the wider discussion about these issues in Brazil and, more broadly, in Latin America.