Key legal question
Whether the cantonal court violated the claimants' right to evidence by refusing a handwriting expert comparison with the widow's writing.
Extracted holding
The refusal violated the claimants' right to proof under Art. 8 CC because the requested expert evidence was in principle suitable to clarify the alleged forgery.
Extracted reasoning
The lower court did not assess the suitability of the requested evidence, but instead reasoned about who may have forged the will and about the available comparison material. Since the claimants had timely requested a relevant expert comparison, they were entitled to be heard on that evidence.