63That requirement moreover corresponds to the purpose of the derived rights of entry and residence provided for by Directive 2004/38 for family members of Union citizens, as otherwise the fact of its being impossible for the Union citizen to be accompanied or joined by his family in the host Member State would be such as to interfere with his freedom of movement by discouraging him from exercising his rights of entry into and residence in that Member State (see, to that effect, Metock and Others, paragraph 63).
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