Volume 29 - Article 9 | Pages 233–246  

Family influence in fertility: A longitudinal analysis of sibling correlations in first birth risk and completed fertility among Swedish men and women

By Johan Dahlberg

Abstract

Background: The intergenerational transmission of fertility has received much attention in demography. This has been done by estimating the correlation between parents’ and offsprings’ fertility. An alternative method that provides a more comprehensive account of the role of family background - sibling correlations - has not been used before.

Objective: I estimate the overall importance of family background on entry into parenthood and completed fertility and whether it changed over time. Furthermore, I compare the intergenerational correlation in completed fertility with corresponding sibling correlations.

Methods: Brother and sister correlations in first birth hazard and in final family size were estimated using multi-level event-history and multi-level linear regression on Swedish longitudinal register data.

Results: The overall variation in fertility that can be explained by family of origin is approximately 15%-25% for women and 10%-15% for men. The overall importance of the family of origin has not changed over the approximately twenty birth cohorts that were studied (1940-63 for women, 1940-58 for men). Parents’ completed fertility accounts for only a small share of the total family background effect on completed fertility.

Conclusions: This study contributes to the existing understanding of intergenerational transition of fertility, both methodologically, by introducing a new and powerful method to study the overall importance of family of origin, and substantially, by estimating the overall importance of family of origin and ist development over time. A non-negligible proportion of the variation in fertility can be attributed to family of origin and this effect has remained stable over twenty birth cohorts.

Author’s Affiliation

• Johan Dahlberg - Stockholms Universitet, Sweden EMAIL

Other articles by the same author/authors in Demographic Research

Explaining Swedish sibling similarity in fertility: Parental fertility behavior vs. social background
Volume 39 - Article 32

Similar articles in Demographic Research

Explaining Swedish sibling similarity in fertility: Parental fertility behavior vs. social background
Volume 39 - Article 32    | Keywords: age at first birth, sibling correlation, social background, socialization

The empirical content of season-of-birth effects: An investigation with Turkish data
Volume 37 - Article 57    | Keywords: earnings, education, family background, season of birth

A matter of norms: Family background, religion, and generational change in the diffusion of first union breakdown among French-speaking Quebeckers
Volume 35 - Article 27    | Keywords: divorce, family background, intergenerational transmission of divorce, marriage, separation, unmarried cohabitation

The causal effect of an additional sibling on completed fertility: An estimation of intergenerational fertility correlations by looking at siblings of twins
Volume 32 - Article 51    | Keywords: fertility, instrumental variables, intergenerational transmission of fertility, Sweden