22The Court has held that Article 20 TFEU precludes national measures, including decisions refusing a right of residence to the members of the family 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 (see, inter alia, 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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