Family members are related parties
Article 35 treats individuals related within the fourth degree of kinship or affiliation as related parties. That reaches parents, children, siblings, grandparents, uncles, aunts and first cousins, and relationships by marriage. Any company those relatives own 50% or more of is also related.
Article 36 adds that payments to an owner, director or officer, and to their related parties, are deductible only to the extent they reflect market value. That is the rule that catches family payroll.