In summer 2019, the European legislator adopted an important reform in the area of European law on matrimonial matters and matters of parental responsibility. From 1 August 2022, the Brussels IIb Regulation will be applied as a new European set of rules and replace the rules of the Brussels IIa Regulation. The set of rules on „parental responsibility“ particularly concerns proceedings on custody and the right of access. The aim of the changes is to give children and their parents more legal certainty in cross-border situations. This involves a number of changes that affect the work of family courts and child and youth welfare services. The most important changes concerning jurisdiction, recognition and enforcement of court decisions across borders and concerning cross-border cooperation as well as their effects will be explained in detail.