Introduction: Authorities within the health care sector have a big responsibility for public health, where health promotive and preventive work methods applies to achieve a positive public health development. A big public health problem is obesity, which is a large contributing factor to lifestyle diseases that affects both adults and children. In Sweden statistic show that every fifth child is obese. An important arena is family centres which should work for guiding and supporting off families to a better health through informing the families about healthy habits. Purpose: Investigate how three family centres in southern Sweden work health promotive and preventive with families about obesity. Method: The study was performed with help from a qualitative method. Semi-structured interviews with twelve occupational professions got to represent the result. The interviews were transcribed and evaluated with a content analysis. Results: Make healthy living habits visible, guide and educate parents, different working methods, approach to the families were meaningful for the health promotive and preventive work at the family centres. The result also highlighted challenges and difficulties in the family centres work. Conclusion: The theory KASAM could be linked to the work of the family centres, as a sense of context could be important for the work with the families to perceive comprehensibility, manageability and meaningfulness. The visibility of people´s living habits is best done through a collaboration between several key players. The family centres work is important for the future public health, implementation of resources is therefore important.