Question juridique clé
Whether the public-law appeal was admissible despite the absence of a general statutory residence-permit entitlement.
Solution extraite
The appeal was admissible because X. could invoke a possible family-life-based claim under Art. 8 ECHR and Art. 13 BV through his Swiss child.
Motifs extraits
A foreign parent may rely on family life when there is a close and effectively lived relationship with a Swiss child who has a right to stay in Switzerland, even if the parent lacks custody.