Since the publication of the seminal book of essays Household and family in past time in 1972, much research on the history of the family has concentrated on the situation in western and eastern Europe, and relied almost exclusively on census-type documents. It is, for example, established that whereas mean household size was small, the mean age at first marriage fairly high and neo-localism (the formation of an independent household on marriage) dominant in western Europe, almost the opposite applied in eastern Europe. Yet these findings do not preclude the possibility of discovering regions where in statistical terms the mean household size was not large and the proportion of complex households not particularly high, but where the neo-local mode of household formation was not the norm. Such a region could have a preference for joint families (two or more married sons co-residing with their father) with a low-fertility demographic regime, or stem families (one co-residing married son) with that of intermediate to low fertility.

Traditional Japan is an example of just such a stem-family society. There the household, not the individual, was perceived as the basic social and legal unit of society. This unit was called ie and its headship, authority and property were expected to be handed down from the father to a particular son, enabling the household to follow alternating stages of ‘simple’, ‘multiple’ and ‘extended’ forms over the developmental cycle, more or less in accordance with the predictions of Lutz Berkner. As articles in the section of Laslett and Wall's Household and family on Japan have already shown, the mean household size in eighteenth- and nineteenth-century Japan was not higher than that in England, but the mean age at marriage was lower than in the English population. Moreover, household formation and succession rules under the Japanese ie system were not compatible with the simple family mode.