Residential burial at Río Viejo marked deceased adults as members of particular houses and as witnesses and actors within the world of the living after their physical deaths. The standardization in burial locations, positions, and offerings emphasized the group identity of Río Viejo adults and their shared house histories. The simultaneous commitment to keeping individual bodies separate and intact, however, indicates that this group identity was not achieved through the subjugation of individual identities. Instead, at Río Viejo, the deceased were celebrated as a cohort of ancestors made up of unique individuals, rather than as a single-minded collective group. [residential burial, Mesoamerica, ancestors, social identities, age]