In Southern Kazakhstan, interethnic families—formed by Kazakhs, Uzbeks, Russians, Tatars, Azerbaijanis, and Meskhetian Turks—inhabit cultural and emotional geographies shaped by shifting borders, contested histories, and unresolved legacies of the Soviet past. These families live between overlapping systems of values, belonging, and memory, where national narratives remain fluid, and identity remains in negotiation. Rather than focusing on large-scale institutional dynamics, this paper turns to the intimate, everyday practices of mixed-ethnicity families as they navigate uncertainty not in theory, but in life. Based on extensive ethnographic fieldwork across five rural villages in the Turkestan Region, I explore how families manage cultural and mnemonic (un)certainties: how they raise bilingual children, reconcile hybrid religious and ritual calendars, perform kinship in ways that do not always align with dominant models of ethnic belonging, and pass on stories and knowledge that disrupt clear-cut boundaries between “tradition” and “modernity.” In a context where official memory regimes often silence or erase the complexity of lived histories, these families quietly sustain alternative modes of remembering and being. This paper argues that interethnic families function as spaces of everyday resilience, where uncertainty is not simply endured but actively reworked. Drawing on decolonial theory and memory studies, I conceptualise these families as mnemonic agents—not victims of fragmentation, but agents of cultural synthesis who creatively adapt, reinterpret, and sometimes resist dominant structures of power. Their lived experiences reveal that uncertainty is not only a source of anxiety but also of potential: a state that allows for fluidity, redefinition, and coexistence. In the broader post-Soviet landscape—marked by resurging nationalism, contested identity politics, and shifting regional alliances—these families complicate the narrative of polarisation. Their everyday practices offer a form of grounded cohabitation that neither erases difference nor idealises harmony. Instead, they show how people live with contradictions: how rituals, language choices, naming practices, and even silences become tools to negotiate fragile forms of belonging in uncertain times. By framing interethnic families as “laboratories of coexistence,” this paper contributes to broader debates at the intersection of memory, identity, and resilience in uncertain socio-political environments. In doing so, it positions Southern Kazakhstan as a revealing site for understanding how cultural complexity operates not only beyond Europe, but beyond binaries of stability and chaos.