Key legal question
Whether the complaint in public law matters was admissible despite Art. 83 lit. c ch. 2 BGG
Extracted holding
The appeal was admissible because the appellant could plausibly invoke a residence right based on Art. 8 ECHR and Art. 13 BV through his relationship with his Swiss child.
Extracted reasoning
A close and effectively lived family relationship with a Swiss child can ground standing and, in principle, a residence claim even without custody, but the merits depend on the intensity of the relationship.