This chapter describes and analyses the developments in Nordic family law, the law of succession and the legal relationship between children and parents. There is a long tradition of trying to harmonize family law, and cooperation in this field was especially intense when new legislation on marriage was being drafted at the beginning of the twentieth century. By contrast, the regulation of property relations between cohabitants has taken place without any Nordic cooperation and with very different solutions. Therefore, it is interesting that harmonization has led to almost identical regulation of same-sex relations, although the tempo has differed.