Kernrechtsfrage
Whether the child maintenance was calculated unlawfully by reducing Zürich table amounts by 30% and splitting the child's cash needs between the parents despite the mother's deficit.
Extrahierter Entscheid
The child maintenance assessment was legally flawed and had to be reassessed; the blanket 30% reduction and the allocation of part of the child's cash needs to a parent in deficit were incompatible with federal law.
Extrahierte Begründung
A difference in housing costs does not justify a uniform 30% reduction of all living costs; the care-and-upbringing component must be borne in kind by the custodial parent and cannot be charged as cash outlay, and a parent in deficit cannot be made to bear part of the child's cash needs.