There are two types of dual-occupation cases; cases where the 'head of a family' holds dual occupations and cases where the 'family' holds dual occupations, and in the latter cases the head of a family who has know-how for farming is engaged in agriculture and the other members including his/her children and grandchildren gain an income from another occupation.
兼業には「世帯主」の兼業と「世帯」の兼業があるが、世帯の兼業では農業ノウハウを持った世帯主が農業に従事し、それ以外の子や孫が他業種で収入を得る。