Changes in the structure of a family and family interaction are studied in the given article together with social roles of a man and a woman during socialism which was characterized by violation of the patriarchal system of the Bulgarians in South Bessarabia. Besides, it's about violation in intergenerational transmission and changes in the ethnic composition of the Bulgarian group in the region with regard to its involvement from an industrial to an information soviet society. This led to the intensification of the population's communicative behaviour and therefore to violations in the Bulgarian group's endogamy of the region. During socialism changes of Bulgarian population's family structure take place in Budzhak. Within the set time period a number of simple nuclear families was rising due to living alone retirees and dislocated marriages of younger generation. Family workflow changes take place together with devide between intergenerational social transmission as the result of equalisation of rights between men and women together with inclusion of a woman into working and social life. Thus, both educational and social functions completely moved from a family to the government institution which in turn led to the formation of a generation that didn't own knowledge and practice to resume traditional life praxis. It became irrelevant the same as a role of the third generation. In consequence, a new family was formed where social knowledge for keeping lifestyle was passed from children to parents. Rising Bulgarian mobility and dynamism influenced on process-related activities between ethnic groups of the region, on forming civil society with equal legal rights instead of patriarchal ones. It also reduced the meaning of " endogamy" and contribute to local Bulgarian population's openness.