<p>Mono-parental families, reconstituted families, families in liberal relationship, homo-parental families, intercultural families… In postmodern times, we are surrounded by different concepts of families. Postmodernism is marked by relativism of life-concepts, liberty and insurance at the same time. In actual debates about family-concepts, traditional images and orientations are losing each time more their assurance. This article reflexions the roots, which has the ideal of a nuclear family since pre-modern times, passing modern times&nbsp;unto postmodern times. Having in mind, that social work is a profession of Social Sciences with a practice focus, this article wants to initiate the following critical reflexions: Which are the functions, the sense and the valour of the institution: family? What should be the consequences for social work? Which type of programs and policies should be structured for services and wellbeing of families?</p>