Judgment of the Court (Sixth Chamber) of 2 April 2020.#Caisse pour l'avenir des enfants.#Request for a preliminary ruling from the Conseil supérieur de la Sécurité sociale (Luxembourg).#Reference for a preliminary ruling – Article 45 TFEU – Social security for migrant workers – Regulation (EC) No 883/2004 – Article 1(i) – Freedom of movement for workers – Equal treatment – Social advantages – Directive 2004/38 – Article 2(2) – Regulation (EU) No 492/2011 – Article 7(2) – Family allowance – Concept of ‘members of the family’ – Exclusion of the children of the spouses of non-resident workers – Difference in treatment in comparison with the children of the spouses of resident workers