Inter-ethnic marriages present a captivating arena for examining assimilation and acculturation processes, where individuals from diverse cultural backgrounds merge their identities. This article delves into the dynamics of inter-ethnic marriages in the Turkestan region of Southern Kazakhstan through the lens of assimilation and acculturation theories. Utilizing data collected from 45 interviews across five villages, including Zhana Iqan, Hantagy, Shornak, Turki poselkasy, and Kentau, the study explores various aspects of daily life such as language usage, religious practices, traditions, cuisine, and ethnic values. Research questions probe how individuals negotiate cultural differences in their interactions and interpret multicultural coexistence through assimilation, acculturation, and dissimilation theories. The hypothesis posits three cohabitation patterns -acculturation, assimilation, and dissimilation- equally valid within the same cultural and geographical space. Employing qualitative methods including interviews and surveys, the study uncovers patterns of adaptation and the degree of assimilation or acculturation within relationships. By analyzing data through the prism of assimilation and acculturation theories, the study sheds light on how cultural elements are integrated into daily routines and decision-making processes within inter-ethnic marriages. This research contributes to a deeper understanding of how individuals navigate cultural diversity within marital relationships, enriching scholarly discourse on multiculturalism and societal relations.