How and whether the diagnosis borderline personality disorder of the mother affects their child and their bond, is to be explained in this paper. For a better understanding of this relation, the borderline personality disorder, binding and binding behaviour are described. A detailed description of the borderline symptomatology follows the description of possible causes. Subsequently, a closer look at binding and binding behaviour, where the mother- child bond is focused mainly. Furthermore, methods from the perspective of social work when dealing with borderline patients and their children are introduced. In addition, facilities that can be contacted by children of mentally ill parents, as well as facilities for borderline patients are mentioned.