This article aims to be what Jasbir Puar referred to as ‘an unfolding archive’. It makes a critical intervention at a historical crisis point as it is unfolding. It sets out to examine the logic that writes the relations between bodies, borders and kin during the political crisis that transpired at the border of Belarus and Poland in 2021. I think of this logic in terms of a ‘grammar’, drawing on the idea articulated by Hortense J. Spillers, where ‘American grammar’ (...) fleshes out the connection between slavery, kinship, nation-building and the processes of gendering. I examine the rubrics of the hegemonic national grammatics in contemporary Poland, which establishes who counts as kin and who belongs to the nation in the context of the border crisis. I offer the concept of ‘declining’ kinship to seek generative (im)possibilities to articulate affinities and solidarities running against the dominant system of reproductive nationalism. (shrink)