Key legal question
Whether the father could challenge the maintenance assessment by arguing his income was only hypothetical and lower than assumed.
Extracted holding
The complaint contained only unsubstantial, appellate criticism and did not show arbitrariness in the finding that he could earn CHF 6,000 net monthly at full capacity.
Extracted reasoning
In child maintenance matters under Art. 98 BGG, only constitutional violations may be raised. The appellant did not demonstrate any qualified, obvious defect in the cantonal court's assessment of earning capacity and income calculation.