Kernrechtsfrage
Whether new maintenance requests may be raised in the cross-appeal reply under Art. 138(1) ZGB
Extrahierter Entscheid
Art. 138(1) ZGB guarantees only a federal minimum standard: new facts and evidence, and new claims prompted by them, must be allowed at least once in the upper cantonal instance, but the canton may set the time limit. Schwyz law did not violate federal law by excluding a new maintenance request in the reply to the cross-appeal.
Extrahierte Begründung
The Court relied on the legislative history and held that the provision favors truth-finding but leaves procedural timing to cantonal law. A party who could have raised the request in its own appeal cannot rely on federal law to cure that omission.