The Dublin III Regulation provides for family reunification in Art. 8-10, 16, 17(2), which stipulate that the Member State within the EU responsible for the asylum application of a person is the one in which family members - in the case of unaccompanied minors also relatives and siblings - are already located. In this context, the reference person must provide evidence of an ongoing asylum procedure or one that has been concluded with international protection status, although there are broad exceptions, especially for unaccompanied minors. If a Member State refuses to accept a person, he or she must remain in the state where the asylum application was filed, and family reunification does not take place. The states - above all Germany - apply the regulations very strictly and place excessive demands on the proof of the individual requirements - especially the proof of family ties. This leads to families remaining permanently separated. As the procedures are purely intergovernmental, the persons concerned often do not learn about the reasons for the rejection at all or only at a late stage. The supervision of such proceedings and action against unlawful refusals is therefore required in order to enforce the responsibility of states to establish family unity. The guideline presents the procedure and, in particular, the most frequent problems and the possibilities to take action against them.