Key legal question
Whether payments under solidarity liability for the son's restaurant were deductible business losses of the appellants' own sole proprietorship.
Extracted holding
No. The expenses were private family support and not business-related costs of the appellants' restaurant.
Extracted reasoning
Although the father substantially assisted the son, the venture was run as the son’s sole proprietorship; the parties did not jointly operate the restaurant, and the evidence showed only a family-based support relationship, not a partnership. The payments therefore related to the father personally and could not be deducted under business expense rules.