Question juridique clé
Whether the subsidiary constitutional complaint against the cantonal return decision was admissible and whether the Federal Court could itself order return.
Solution extraite
The complaint was admissible as a subsidiary constitutional remedy, but the Federal Court could only annul the cantonal judgment and instruct the cantonal court to order return itself.
Motifs extraits
Return proceedings under the Hague Convention are not ordinary civil disputes; due to the strictly cassatory nature of the constitutional complaint, the Federal Court could not directly order the child’s return.