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The Science of Adult Sibling Dynamics: Why the Old Roles Never Left
Most families never vote on who's the favorite, the screwup, or the reliable one — the roles just harden, usually before anyone in them could argue back. Decades of research on parental treatment and adult sibling relationships show what that leaves behind: measurable differences in how parents treat their children, adult siblings who can describe the gap in specific detail, and a self-story — 'less loved,' 'the problem,' 'the fixer' — that keeps running whether or not anyone still believes it. Here's what the data says about who gets cast into which role, why it doesn't dissolve just because you've changed, and why more than one in four adults ends up estranged from a sibling at some point — usually for reasons bigger than either sibling alone.
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01 Where does the 'family scapegoat' concept in family-systems research come from?
Vogel and Bell's 1960 paper described how an emotionally disturbed child could embody and carry unresolved tension between other family members — the origin of what's now called the family scapegoat role. source ↗
02 In Jensen and colleagues' 2013 study, what did siblings who received less parental support than their brother or sister report?
Jensen and colleagues found that among 151 sibling pairs, the offspring who reported receiving less parental support relative to their sibling reported significantly more depressive symptoms. source ↗
03 Gilligan and colleagues (2013) found that perceived favoritism by which parent predicted more sibling tension in adulthood?
Gilligan, Suitor, Kim and Pillemer found that perceived paternal favoritism predicted sibling tension in adulthood, while perceived maternal favoritism did not — and the effect was strongest for daughters. source ↗
04 According to Peng, Suitor and Gilligan (2018), recalling childhood favoritism predicted adult depressive symptoms:
Peng, Suitor and Gilligan found that both childhood recollections and current perceptions of maternal favoritism predicted depressive symptoms, with no moderating effect of birth order or gender — the link held across family positions. source ↗
05 Hank and Steinbach's (2023) large panel study found that sibling estrangement is most often triggered by:
Using pairfam panel data on 5,729 people, Hank and Steinbach found sibling estrangement was best predicted by structural characteristics of the sibling relationship and disruptive family events — especially parental divorce or death — rather than one-off conflicts. source ↗