Oh half-brother, where art thou? The boundaries of full- and half-sibling interaction

Linus Andersson
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Linus Andersson: Stockholms Universitet

Demographic Research, 2020, vol. 43, issue 16, 431-460

Abstract: Background: Research indicates that both full- and half-siblingships develop enduring social relationships, if the siblings have the opportunity to interact during childhood and adolescence. Objective: To estimate: (1) how much time half- and full-siblings are exposed to each other during childhood and adolescence; (2) how half-sibling exposure is conditional on birth spacing and residency; and (3) how parents' social vulnerability is associated with different levels of lifetime exposure to half-siblings. Methods: Swedish register data is used to calculate exposure to half-siblings based on birth spacing and registered residency for all full- and half-siblings in the 1994 birth cohort. Results: A substantive share of half-siblings are less exposed to each other due to lengthy birth spacing and residency patterns. By age 18, 26% of the birth cohort have had a half-sibling who is also no older than 18 for at least one year; 13% of the birth cohort have had a half-sibling who is no older than 18 for up to 10 years; 8% of the birth cohort have been registered in the same dwelling as another half-sibling for eight years or more. Parents’ social vulnerability does not predict exposure to halfsiblings among the population that has at least one half-sibling by age 18. Conclusions: Even though half-siblings constitute a large share of all siblings, full-siblings will likely make up the vast majority of the siblingship-like relationships because so many halfsiblings are unable to interact during childhood or adolescence due to extensive age differences and/or because they do not coreside. Contribution: This study quantifies the role of birth spacing and residency patterns for the exposure to full and half siblings across childhood. It highlights the benefits of including a population perspective for understanding full and half sibling social relationships.

Keywords: siblings; childhood; half sibling; family complexity; multi partner fertility; siblingship (search for similar items in EconPapers)
JEL-codes: J1 Z0 (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:dem:demres:v:43:y:2020:i:16

DOI: 10.4054/DemRes.2020.43.16

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