24In particular, the Court has held that, where, during the genuine residence of a Union citizen in a Member State other than that of which he is a national, pursuant to and in conformity with the conditions set out in Directive 2004/38, family life is created or strengthened in that Member State, the effectiveness of the rights conferred on the Union citizen by Article 21(1) TFEU requires that that citizen’s family life in that Member State may continue when he returns to the Member State of which he is a national, through the grant of a derived right of residence to the third-country national family member concerned. If no such derived right of residence were granted, that Union citizen could be discouraged from leaving the Member State of which he is a national in order to exercise his right of residence under Article 21(1) TFEU in another Member State because he is uncertain whether he will be able to continue in his Member State of origin a family life which has been created or strengthened in the host Member State (see, to that effect, judgment of 12 March 2014, O. and B., C‑456/12, EU:C:2014:135, paragraph 54 and the case-law cited).
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