European Union – Family proceedings. Article 15 of Regulation (EC) No 2201/2003 should be interpreted as not applying in circumstances, such as those in the main proceedings, in which both courts seised had jurisdiction as to the substance of the matter under arts 12 and 8, respectively, of that regulation. The Court of Justice of the European Union so held in a preliminary ruling in proceedings between the parties concerning, among other things, the exercise of parental responsibility over their three children following their divorce.