Question juridique clé
Whether the public law appeal was admissible under the Foreign Nationals Act and LTF
Solution extraite
The appeal was admissible because the claimant could, in principle, rely on Art. 42 LEtr as a minor child of a Swiss citizen at the relevant time.
Motifs extraits
The existence of a substantive entitlement is a merits question; it sufficed that the reunification request was filed while the son was still a minor.