49In that context, the Court has held that Article 20 TFEU precludes national measures, including decisions refusing a right of residence to the family members of a Union citizen, which have the effect of depriving Union citizens of the genuine enjoyment of the substance of the rights conferred by virtue of their status (judgments of 8 March 2011, Ruiz Zambrano, C‑34/09, EU:C:2011:124, paragraph 42; of 6 December 2012, O and Others, C‑356/11 and C‑357/11, EU:C:2012:776, paragraph 45; and of 10 May 2017, Chavez-Vilchez and Others, C‑133/15, EU:C:2017:354, paragraph 61).
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