The term "vulnerable families" refers to familial living situations that are considered problematic, with a particular need for socially responsible, professionally provided support. This means of categorising families is extremely ambivalent, indicating not only a need for society to support forms of family life and family achievements, but also a particular need to protect children growing up within the family. It also has implications for an understanding of interventions geared to the riskiness of family living situations and their standardisation, an understanding that risks losing sight of families' variety and individual peculiarities. Families in need of support have a fundamental right for their individuality and parenthood to be recognised. A detailed case analysis of a social worker who is working with a family in which a child's wellbeing is at risk shows how transferring standardising ideas about the family can damage that basic right. The article thus calls for the category of vulnerability to be applied to families with reflection on the specific case and on implicit normative leanings.