Key legal question
Whether Swiss courts had territorial jurisdiction to decide the father's visitation rights after the children's habitual residence moved to France.
Extracted holding
No. Once the children were habitually resident in France, only the authorities of the new habitual-residence state were competent to decide personal relations; Swiss courts lacked territorial jurisdiction.
Extracted reasoning
Visitation rights are child-protection measures under the Hague Convention of 5 October 1961. Under Article 1 of that Convention, authorities of the child's habitual residence are competent. The later change of residence did not preserve Swiss jurisdiction, because perpetuatio fori does not apply in this setting.