The aim of this paper is to achieve a better understanding of the impact of bilingualism on children, considering the dimensions of languages, language use and identity. Since 2009, this study has been observing German-Brazilian children in an institutional out-of-home-setting in Bonn, Germany, as a case study. The main question is: “which role does bilingualism play in constructing children’s identities?” The research techniques are participant observation and informal interviews with families. The results show the need of an updated concept that enables to understand interactions between languages, cultures and societies. This paper represents a work in progress and is submitted as a contribution to the wider ongoing project of developing the concept of “Mehrraum” as an added value space.