This article examines factors that promote active multilingualism. For this purpose, the "Peabody Picture Vocabulary Test" was used with 48 children. Their results were linked to a parental questionnaire designed to evaluate the children's linguistic input in their immediate environment. The study shows that, besides a minimum amount of linguistic input, the language constellation (i.e. presence/absence of the majority language at home) is also decisive. At the same time, it seems irrelevant for active bi- and trilingualism which family language policies are chosen (e.g. One person-One Language), as long as the promotion of the minority language does not only take place institutionally, but also at home. Overall, the results indicate that attending a bilingual kindergarten/school alone does not lead to active multilingualism. Family factors and family support seem to be decisive. These include the creation of a linguistically stimulating environment through cultural contact and the language constellation within the family.