The primary objective of this paper is to address the methodology employed in qualitative migration research. It involves a theoretical analysis of the methodological challenges associated with a case study design, necessitating the collection of accounts from multiple individuals participating in the studied process or event. The second aim is to empirically illustrate these considerations through a study focusing on the relationship between Polish hosts and Ukrainian guests (2022–23). The gathered empirical material indicates the effectiveness of applying the technique of cross stories (récits croisés) derived from biographical research, along with the ontological-epistemological difficulties encountered. The paper does not aim to offer a comprehensive analysis of the cohabitation phenomenon. Instead, it contributes to the field by explicitly citing significant portions of raw material and elucidating their context. Its impact on migration studies lies in demonstrating, from a methodological perspective, that the simultaneous examination of various viewpoints and definitions of situations allows researchers to leverage the full potential of qualitative research. Through cross stories, a more profound understanding of interviewees’ perspectives on the world emerges, enabling researchers, when necessary, to question common-sense meanings of certain categories and highlight gaps in biographical accounts.