53Accordingly, where the competent national authority receives an application from a third-country national for the grant of a right of residence for the purpose of family reunification with a Union citizen who is a national of the Member State concerned, that authority cannot automatically reject that application on the sole ground that the Union citizen does not have sufficient resources. On the contrary, it is for that authority to assess, on the basis of the evidence which the third-country national and the Union citizen concerned must be free to provide and, if necessary, by carrying out the necessary investigations, whether there is a relationship of dependency between those two persons as described in paragraph 39 of this judgment, such that a derived right of residence must, in principle, be granted to that national under Article 20 TFEU (see, to that effect, judgment of 10 May 2017, Chavez-Vilchez and Others, C‑133/15, EU:C:2017:354, paragraphs 75 to 77).
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