Question juridique clé
Whether the cantonal court correctly assessed a notable change in circumstances under Art. 286 CC by focusing on the father's expenses without determining his income.
Solution extraite
The income of the maintenance debtor had to be established, because both income and necessary expenses are relevant to determine whether circumstances changed materially and what support remains payable.
Motifs extraits
A new child may increase charges, but the debtor's income at divorce and at modification time is decisive for assessing the change and recalculating maintenance. The cantonal court erred by treating income as irrelevant.