Language heterogeneity in the classroom is quite a common phenomenon. For experts, it is a challenge; for teachers and parents, it is most often a problem. This challenge or problem will be discussed on the basis of the theory of multilingual education and migration pedagogy. The aim of this contribution is to present an app that can be regarded as a universal tool for fostering multilingualism and explaining it from the viewpoint of parents, since they are an important but often ignored aspect of multilingual education. The research analysis will illustrate and interpret the research results of a qualitative study in which parents from different countries participated. It is not country specific, but it highlights the key aspects that can foster multilingual education and that at least partly match with the underlying theory.