the relationship. Under the ie system, only a minority of households included three generations at a time because nonsuccessor sons (those who were not heirs) often set up their own household. From 1970 to 1983, the proportion of three-generation households fell from 19% to 15% of all households, while two generation households consisting of a couple and their unmarried children increased only slightly, from 41% to 42% of all households. The greatest change has been the increase in couple-only households and in elderly single-person households. Public opinion surveys in the late 1980s seemed to confirm the statistical movement away from the three-generation ie family model. Half of the respondents did not think that the first son had a special role to play in the family, and nearly two-thirds rejected the need for Mukoyōshi adoption of a son in order to continue the family. Other changes, such as an increase in filial violence and school refusal, suggest a breakdown of strong family authority. Official statistics indicate that Japanese concepts of family continued to diverge from those in the United States in the 1980s. The divorce rate, although increasing slowly, remained at 1.3 per 1,000 marriages in 1987, low by international standards. Strong gender roles remained the cornerstone of family responsibilities. Most survey respondents said that family life should emphasize parent-child ties over husband-wife relations. Nearly 80% of respondents in a 1986 government survey believed that the ancestral home and family grave should be carefully kept and handed on to one's children. More than 60% thought it best for elderly parents to live with one of their children. This sense of family as a unit that continues through time is stronger among people who have a livelihood to pass down, such as farmers, merchants, owners of small companies, and physicians, than among urban salary and wage earners. Anthropologist Jane M. Bachnik noted the continued emphasis on continuity in the rural families she studied. Uchi (here, the contemporary family) were considered the living members of an ie, which had no formal existence. Yet, in each generation, there occurred a sorting of members into permanent and temporary members, defining different levels of uchi. Various family life-styles exist side by side in contemporary Japan. In many urban salaryman families, the husband may commute to work and return late, having little time with his children except for Sundays, a favorite day for family outings. The wife