Research into migration and social networks has suggested that migrants are relationally more vulnerable than
non-migrants, especially those in endogamous couples. However, non-probability samples and lack of data about
partners’ networks have often impeded rigorous testing. This paper analyses the influence of migration and
mixedness (unions between two persons from different geographical origins) on some compositional and
structural measures of the core discussion networks of the adult population in Spain, paying special attention to
the partner’s role. Data from the 2013 Spanish General Social Survey (SGSS) were used. A graph census shows
the predominance of complete graphs both for endogamous and exogamous couples, but more clearly in the case
of natives. Multivariate models prove that, in general, Spaniards in mixed unions seem less partner-dependent,
whereas endogamous immigrants seem the most affected by the effects of the geographical mobility on relational
vulnerability.
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