Key legal question
Whether the administrative appeal was admissible in immigration matters despite the general bar to appeals against residence permits.
Extracted holding
The appeal could be considered only to the extent that Y., as German national, might in principle rely on treaty rights; the mother's standing remained doubtful but was left open because the appeal failed on the merits.
Extracted reasoning
A foreigner normally has no entitlement to a residence permit, but a treaty-based right can remove the inadmissibility bar. The child's nationality made treaty reliance at least arguable.