The connection with adolescent space and, more specifically, its mobility, is often comprehended through the framework of the family and of a single residential location. However, some individuals experience adolescence via multiresidential situations, more especially related to a taking into care linked to a geographical shift. An analysis of the residential situations of foster children brings out a range of patterns, involving parents but also extended families and those in their immediate environment. Adolescent territorial appropriation thus takes over numerous spaces: third-party spaces that appear between the family home and the residential location, demonstrating the existence of an emotional relationship with the territory.