“… citizen of the European Union on every person holding the nationality of a member state: see, inter alia, D'Hoop v Office national de l'emploi (Case C-224/98) [2004] ICR 137, para 27, and Garcia Avello v Belgian State (Case C-148/02) [2003] ECR I-11613, para 21. Since Mr Ruiz Zambrano's second and third children possess Belgian nat…”