Network of large pedigrees reveals social practices of Avar communities.

From AD 567-568, at the onset of the Avar period, populations from the Eurasian Steppe settled in the Carpathian Basin for approximately 250 years1. Extensive sampling for archaeogenomics (424 individuals) and isotopes, combined with archaeological, anthropological and historical contextualization of four Avar-period cemeteries, allowed for a detailed description of the genomic structure of these communities and their kinship and social practices. We present a set of large pedigrees, reconstructed using ancient DNA, spanning nine generations and comprising around 300 individuals. We uncover a strict patrilineal kinship system, in which patrilocality and female exogamy were the norm and multiple reproductive partnering and levirate unions were common. The absence of consanguinity indicates that this society maintained a detailed memory of ancestry over generations. These kinship practices correspond with previous evidence from historical sources and anthropological research on Eurasian Steppe societies2. Network analyses of identity-by-descent DNA connections suggest that social cohesion between communities was maintained via female exogamy. Finally, despite the absence of major ancestry shifts, the level of resolution of our analyses allowed us to detect genetic discontinuity caused by the replacement of a community at one of the sites. This was paralleled with changes in the archaeological record and was probably a result of local political realignment.

Greater post-Neolithic wealth disparities in Eurasia than in North America and Mesoamerica.

How wealth is distributed among households provides insight into the fundamental characters of societies and the opportunities they afford for social mobility. However, economic inequality has been hard to study in ancient societies for which we do not have written records, which adds to the challenge of placing current wealth disparities into a long-term perspective. Although various archaeological proxies for wealth, such as burial goods or exotic or expensive-to-manufacture goods in household assemblages, have been proposed, the first is not clearly connected with households, and the second is confounded by abandonment mode and other factors. As a result, numerous questions remain concerning the growth of wealth disparities, including their connection to the development of domesticated plants and animals and to increases in sociopolitical scale. Here we show that wealth disparities generally increased with the domestication of plants and animals and with increased sociopolitical scale, using Gini coefficients computed over the single consistent proxy of house-size distributions. However, unexpected differences in the responses of societies to these factors in North America and Mesoamerica, and in Eurasia, became evident after the end of the Neolithic period. We argue that the generally higher wealth disparities identified in post-Neolithic Eurasia were initially due to the greater availability of large mammals that could be domesticated, because they allowed more profitable agricultural extensification, and also eventually led to the development of a mounted warrior elite able to expand polities (political units that cohere via identity, ability to mobilize resources, or governance) to sizes that were not possible in North America and Mesoamerica before the arrival of Europeans. We anticipate that this analysis will stimulate other work to enlarge this sample to include societies in South America, Africa, South Asia and Oceania that were under-sampled or not included in this study.

Hired helpers at the nest: The association between life-cycle servants and net fertility in North Orkney, 1851-1911.

OBJECTIVES: The presence of kin is often, but not always, associated with higher fertility in historical populations. However, the effect of other household members on fertility is less frequently studied. While not genetically related, life-cycle servants lived and worked alongside household members and may have provided assistance to reproducing families. Female servants in particular may have helped mothers with small children through direct help with childcare activities or by replacing the economic effort of mothers whose work was not compatible with childcare. This study examines the presence of servants in the households of married women of reproductive age to assess whether households with young children are more likely to also have servants. MATERIALS AND METHODS: This study uses individual-level census data from North Orkney, Scotland (1851-1911) to investigate the relationship between the presence of servants in households and a measure of recent net marital fertility, the number of women's own-children under age 5, using logistic regression models. RESULTS: Households with young children were more likely to have a female, but not male, servant in the household after controlling for the effects of other possible helpers, including older children, mothers, and mothers-in-law. DISCUSSION: These findings are consistent with prior research that indicates the importance of female labor to smallholder agricultural households and suggests that female servants may have provided support to reproducing families. Life-cycle servants should be considered one component of biocultural reproduction in historical Northwest Europe. The use of hired help is not restricted to contemporary or elite groups.

Historical Trends in Children Living in Multigenerational Households in the United States: 1870-2018.

Over the last two decades, the share of U.S. children under age 18 who live in a multigenerational household (with a grandparent and parent) has increased dramatically. Yet we do not know whether this increase is a recent phenomenon or a return to earlier levels of coresidence. Using data from the decennial census from 1870 to 2010 and the 2018 American Community Survey, we examine historical trends in children's multigenerational living arrangements, differences by race/ethnicity and education, and factors that explain the observed trends. We find that in 2018, 10% of U.S. children lived in a multigenerational household, a return to levels last observed in 1950. The current increase in multigenerational households began in 1980, when only 5% of children lived in such a household. Few differences in the prevalence of multigenerational coresidence by race/ethnicity or education existed in the early part of the twentieth century; racial/ethnic and education differences in coresidence are a more recent phenomena. Decomposition analyses do little to explain the decline in coresidence between 1940 and 1980, suggesting that unmeasured factors explain the decrease. Declines in marriage and in the share of White children most strongly explained the increase in multigenerational coresidence between 1980 and 2018. For White children with highly educated parents, factors explaining the increase in coresidence differ from other groups. Our findings suggest that the links between race/ethnicity and socioeconomic status and multigenerational coresidence have changed over time, and today the link between parental education and coresidence varies within racial/ethnic groups.

Twins Support the Absence of Parity-Dependent Fertility Control in Pretransition Populations.

A conclusion of the European Fertility Project in 1986 was that pretransition populations mostly displayed natural fertility, where parity-dependent birth control was absent. This conclusion has recently been challenged for England by new empirical results and has also been widely rejected by theorists of long-run economic growth, where pre-industrial fertility control is integral to most models. In this study, we use the accident of twin births to show that for three Western European-derived pre-industrial populations-namely, England (1730-1879), France (1670-1788), and Québec (1621-1835)-we find no evidence for parity-dependent control of marital fertility. If a twin was born in any of these populations, family size increased by 1 compared with families with a singleton birth at the same parity and mother age, with no reduction of subsequent fertility. Numbers of children surviving to age 14 also increased. Twin births also show no differential effect on fertility when they occurred at high parities; this finding is in contrast to populations where fertility is known to have been controlled by at least some families, such as in England, 1900-1949, where a twin birth increased average births per family by significantly less than 1.

Adapting the Own Children Method to allow comparison of fertility between populations with different marriage regimes.

The Own Children Method (OCM) is an indirect procedure for deriving age-specific fertility rates and total fertility from children living with their mothers at a census or survey. The method was designed primarily for the calculation of overall fertility, although there are variants that allow the calculation of marital fertility. In this paper we argue that the standard variants for calculating marital fertility can produce misleading results and require strong assumptions, particularly when applied to social or spatial subgroups. We present two new variants of the method for calculating marital fertility: the first of these allows for the presence of non-marital fertility and the second also permits the more robust calculation of rates for social subgroups of the population. We illustrate and test these using full-count census data for England and Wales in 1911.

Survival and sex composition of offspring: Individual-level responses in the quantum and tempo of childbearing during the demographic transition.

Previous studies have documented varying fertility responses to childhood mortality and to the sex composition of the surviving offspring during the demographic transition. We contribute to this literature by applying a mixture cure model to reproductive histories of Estonian women born 1850-99. This model, unlike standard event history models, is capable of separating the effect of the covariates on the propensity of having another birth from their effect on its timing. Child fatalities, not having sons, and to a smaller extent, not having daughters, increased the propensity to have another child and decreased the interval to it. The response was stronger among later cohorts, but only with respect to parity progression. By contrast, the accelerated childbearing response diminished over time. Our findings suggest that behavioural responses in the quantum and tempo of childbearing can occur relatively independently.

Did family size affect differences in body height in non-urbanized societies? Evidence from the Lemko community in Poland in the late 19th and early 20th centuries.

The aim of this study was to examine the effect of economic changes in the Polish territories under Austrian partition at the end of the 19th and the beginning of the 20th centuries on the trend in adult body height, and to examine the effect of number of children in a family, as a socioeconomic factor, on the differences in heights of males and females. Data collected in a 1939 survey for a group of 350 Lemkos living in Polish lands under the Austrian partition were obtained from archive material. Individual data were obtained for body height and number of siblings, to calculate family size. Linear regression analysis confirmed an increase in body height in males by about 1.2 cm per decade over the period 1860 to 1922. The number of children in a family did not appear to influence the mean body height of men and women. The observed positive mean body height trend probably resulted from the improvement in the economic conditions in the Austrian sector over the survey period.

Males' Later-Life Mortality Consequences of Coresidence With Paternal Grandparents: Evidence From Northeast China, 1789-1909.

In this study, we investigate the effect of early-life coresidence with paternal grandparents on male mortality risks in adulthood and older age in northeast China from 1789 to 1909. Despite growing interest in the influence of grandparents on child outcomes, few studies have examined the effect of coresidence with grandparents in early life on mortality in later life. We find that coresidence with paternal grandmothers in childhood is associated with higher mortality risks for males in adulthood. This may reflect the long-term effects of conflicts between mothers and their mothers-in-law. These results suggest that in extended families, patterns of coresidence in childhood may have long-term consequences for mortality, above and beyond the effects of common environmental and genetic factors, even when effects on childhood mortality are not readily apparent.

Studying Stepfamilies: Four Eras of Family Scholarship.

Historically, there have always been stepfamilies, but until the early 1970s, they remained largely unnoticed by social scientists. Research interest in stepfamilies followed shortly after divorce became the primary precursor to stepfamily formation. Because stepfamilies are structurally diverse and much more complex than nuclear families, they have created considerable challenges for both researchers and clinicians. This article examines four eras of stepfamily scholarship, tracing the development of research questions, study designs and methods, and conceptual frameworks from the mid-1970s to the present and drawing implications for the current state of the field.

Agency in Fertility Decisions in Western Europe During the Demographic Transition: A Comparative Perspective.

We use a set of linked reproductive histories taken from Sweden, the Netherlands, and Spain for the period 1871-1960 to address key issues regarding how reproductive change was linked specifically to mortality and survivorship and more generally to individual agency. Using event-history analysis, this study investigates how the propensity to have additional children was influenced by the number of surviving offspring when reproductive decisions were made. The results suggest that couples were continuously regulating their fertility to achieve reproductive goals. Families experiencing child fatalities show significant increases in the hazard of additional births. In addition, the sex composition of the surviving sibset also appears to have influenced reproductive decisions in a significant but changing way. The findings offer strong proof of active decision-making during the demographic transition and provide an important contribution to the literature on the role of mortality for reproductive change.

Patriarchy, Power, and Pay: The Transformation of American Families, 1800-2015.

This article proposes explanations for the transformation of American families over the past two centuries. I describe the impact on families of the rise of male wage labor beginning in the nineteenth century and the rise of female wage labor in the twentieth century. I then examine the effects of decline in wage labor opportunities for young men and women during the past four decades. I present new estimates of a precipitous decline in the relative income of young men and assess its implications for the decline for marriage. Finally, I discuss explanations for the deterioration of economic opportunity and speculate on the impact of technological change on the future of work and families.

Marriage Horizons at Woodstock--A Revised Approach.

The double logarithmic straight-line representation of marriage horizon data is a useful tool for their comparison. Current practice is to exclude intra-parochial couples from the calculations. This note argues that these couples should be included and demonstrates that the results of doing so produce significantly improved correlation coefficients.

Shop 'till we drop: a historical and policy analysis of retail goods movement in the United States.

The movement of retail goods is central to modern economies and is a significant-but understudied-fraction of our overall energy footprint. Thus, we propose a new category for energy analysis called Retail Goods Movement (RGM) that draws its boundaries around the portion of freight dedicated to retail goods and the portion of driving dedicated to shopping. Historically, the components of RGM have not enjoyed policy priority. However, the net payoff from energy research and policy directed at RGM may now be high enough relative to other options to deserve increased investment. We combine a quantitative decomposition of the dynamics of RGM energy use with a qualitative discussion of what trends could have contributed to them. The RGM sector's energy use grew from 1.3 EJ (2.8% U.S.) in 1969 to 7.0 EJ (6.6% U.S.) in 2009. The major drivers were increases in population, freight tonnage (before 1990), distance freighted per tonne and driven per shopping trip (after 1990), and weekly shopping trips per household (before 1995). RGM energy intensity increased per capita (180%), per constant dollar GDP (60%), and per retail expenditure (140%). Finally, we describe policy recommendations that could become the basis of a sound RGM resource plan.

Decoupling migration effects from income effects on reproduction in Central American migrant-sending households.

Contemporary data for three Central American countries (Costa Rica, Guatemala, and Nicaragua) surveyed by the Latin American Migration Project were analyzed to determine if migration length and remittance transfers had an influence on fertility. The analysis was structured to separate societal influences on fertility attributable to migration from the income effects associated with remittance transfers. At the couple level, the odds that a birth would occur were negatively associated with an increase in U.S. remittance receipts and an increase in a wife's migration duration. However, no correlation was found between length of male migration and couple fertility.

The educational legacy of unauthorized migration: comparisons across U.S.-immigrant groups in how parents' status affects their offspring.

This research compares several national-origin groups in terms of how parents' entry, legalization and naturalization (i.e., membership) statuses relate to their children's educational attainment. In the case of Asian groups, the members of which predominantly come to the United States as permanent legal migrants, we hypothesize (1) that father's and mother's statuses will be relatively homogenous and few in number and (2) that these will exert minimal net effects on second-generation attainment. For Mexicans, many of whom initially come as temporary unauthorized migrants, we hypothesize (1) that parental status combinations will be heterogeneous and greater in number and (2) that marginal membership statuses will exert negative net effects on education in the second generation. To assess these ideas, we analyze unique intergenerational data from Los Angeles on the young adult members of second-generation national-origin groups and their parents. The findings show that Asian immigrant groups almost universally exhibit similar father­mother migration statuses and high educational attainment among children. By contrast, Mexicans manifest more numerous discrepant father­mother combinations, with those in which the mother remains unauthorized carrying negative implications for children's schooling. The paper discusses the theoretical and policy implications of the delays in incorporation that result from Mexican Americans needing extra time and resources compared to the members of other groups to overcome their handicap of marginal membership status (i.e., being more likely to enter and remain unauthorized).

Cognitive and language skills of Turkish children in Germany: a comparison of the second and third generation and mixed generational groups.

The paper compares several generational groups of Turkish children in Germany with respect to cognitive skills and German language skills at an early age. Empirically, children of inter-marriages outperform the other groups of Turkish children in both tests while children with a first generation mother and a second generation father score worse than all others. All group differences regarding children's cognitive skills can be explained by the families' socio-economic status and educational resources. In contrast, with respect to children's language skills also parents' endowment with receiving country specific resources (e.g., parental German language proficiency) needs to be taken into account.

Partner selection and divorce in ethnic minorities: distinguishing between two types of ethnic homogamous marriages.

This article compares divorce risks according to marriage type. The common dichotomy between ethnic homogamous and ethnic heterogamous marriages is further elaborated by differentiating a third marriage type; ethnic homogamous marriages between individuals from an ethnic minority group and a partner from the country of origin. Based on the analysis of data concerning the Turkish and Moroccan minorities in Belgium, it has been confirmed that the divorce risk associated with these marriages is higher than that of other ethnic homogamous marriages. However, specific divorce patterns according to marriage type also indicate the importance of differences between the minority groups.

Families, time, and well-being in Canada.

We study changes in time and money available to families with children from 1971 to 2006. Increases in incomes at the top of the Canadian income distribution since the mid-1990s have taken place without any significant increases in total family hours of paid work. On the other hand, for families in the middle of the income distribution, family income has stagnated, despite the fact that parents jointly supply significantly higher hours of paid work. If both time and money are valuable resources for the production of well-being for family members, these findings suggest that inequality in well-being has increased even more than inequality of income.