Appeal on Post-Nuptial Support Calculation Method and Burden of Proof

The appellant challenged the lower court's application of the surplus distribution method for calculating post-nuptial support and the requirement to substantiate their needs, arguing the court infringed upon its discretionary power and the duty to prove the factual basis of the claim under Article 8 of the Civil Code. The appellate court rejected this argument, affirming that while the petitioning spouse must substantiate their claim, the opposing spouse has a duty of cooperation in clarifying the facts, meaning the appellant should have provided concrete documentation for their claimed expenses and tax burden; furthermore, federal law does not mandate a specific calculation method, and the surplus distribution method, often utilizing the debt enforcement minimum subsistence level, is standard practice in the canton, with judicial discretion primarily applying to the weighting of factors under Article 125 of the Civil Code, not to excusing the lack of substantiation for easily quantified personal expenses.