TY JOUR TI THE PARTICIPATION OF FAMILY MEMBERS IN OPTIONAL CONTRACTUAL BUSINESS STRUCTURES IN THE IMPLEMENTATION OF FAMILY BUSINESS KW civil law contract KW framework agreements KW option constructions KW family business KW option KW organizational relations KW preliminary agreement KW agreements of intent JO Bulletin of Economic Security AU LEVUSHKIN, A.N. PY 2025 IS PB Moscow University of the Ministry of Internal Affairs of Russia named after V.Ya. Kikot