Connections between linguistic heterogeneity, educational choices and (family) biographies are complex and ever shifting. With this paper, my aim is to explore the question how social spaces are constructed by multilingual families in migration societies and how they situate social spaces 'in between', thereby challenging both binary and national logics and creating "third spaces." Especially in view of national educational institutions, family decisions on language transmission and use are reflected upon and at times re-evaluated. Analysis of family interviews with German migrants in Norway shows how both continuity and change are relevant for the parents as they try to produce an uninterrupted family biography but at the same time need to be open to adaptations to new situations. Expectations, language ideologies and perspectives that transcend one's own family spaces gain relevance while (national) institutions may call for changes in language regimes and practices.