Kernrechtsfrage
Whether the cantonal court arbitrarily calculated the husband's housing and mortgage-related costs for maintenance purposes.
Extrahierter Entscheid
No arbitrariness was shown; the court could rely on the husband's tax return and the remaining evidence did not prove that he alone paid all mortgage charges during the disputed period.
Extrahierte Begründung
The additional bank documents did not establish who made the payments or that they exclusively covered mortgage interest. It was therefore not arbitrary to use the tax return amount and to include the housing charge only for the period when he occupied the house.