52Thus, although the national authorities are not obliged to examine systematically and on their own initiative the existence of a relationship of dependency within the meaning of Article 20 TFEU, the person concerned having to provide the evidence enabling them to assess whether the conditions for the application of Article 20 TFEU are satisfied, the effectiveness of that article would, nonetheless, be jeopardised if the third-country national or the Union citizen, as a member of his or her family, were prevented from relying on the factors which make it possible to assess whether a relationship of dependency, within the meaning of Article 20 TFEU, exists between them (see, by analogy, judgment of 10 May 2017, Chavez-Vilchez and Others, C‑133/15, EU:C:2017:354, paragraphs 75 and 76).
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