In Denmark, a process of defamilising has taken place since the expansion of the Early Childhood Education and Care (ECEC) sector in the 1960s, in the sense that children now spend a large part of their childhood outside the family. Nevertheless, parents are still seen as key figures in children's upbringing and as having primary responsibility for the quality of childhood, implying a simultaneous process of refamilising. Based on ethnographic fieldwork we show that parents are not only held responsible for their children's lives at home, but also for ensuring that ECEC staff have the best possible opportunity to support children's development at ECEC institutions. We analyse how ECEC staff offer guidance on how to be a responsible parent who cooperates in the right ways, and on how to cultivate children's development at home. Parents willingly accept such advice because of a strong risk awareness embedded in diagnostic forms, positioning ECEC staff as parenting experts.