Several possible studies
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Your siblings don't set your personality. It can change throughout life. - The Washington Post (opens in a new tab)
Your siblings don't set your personality. It can change throughout life. · 2026-10-06
Short answer
Several possible studiesNo clear answer.
More than one paper fits the article's details, and none fits well enough to single out. Checking claims against the wrong study would be worse than not checking them at all.
Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.
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The story
Your siblings don't set your personality. It can change throughout life. - The Washington Post
Your siblings don't set your personality. It can change throughout life. · 2026-10-06
The story’s checkable claims.
Read the original story (opens in a new tab)NewsLink checks it
Several studies could be the source of this story.
More than one paper fits the article's details, and none fits well enough to single out. Checking claims against the wrong study would be worse than not checking them at all.
Open claim evidenceSearch result
Several studies could fit.
More than one paper fits the article's details, and none fits well enough to single out. Checking claims against the wrong study would be worse than not checking them at all.
Source layer
The 5 papers the story cites
Source study separated from background citations.
The research anchor for the report.
- The study this story reportsmentioned without context
Birth‐order effects on risk taking are limited to the family environment
Annals of the New York Academy of Sciences · 2024
- The study this story reportsmentioned without context
Changing personality traits with the help of a digital personality change intervention
Proceedings of the National Academy of Sciences · 2021
- Points somewhere elsementioned without context
Life events sometimes alter the trajectory of personality development: Effect sizes for 25 life events estimated using a large, frequently assessed sample
Journal of Personality · 2024
- Cited as backgroundmentioned without context
Life events sometimes alter the trajectory of personality development: Effect sizes for 25 life events estimated using a large, frequently assessed sample
Journal of Personality · 2024
- Cited as backgroundmentioned without context
A systematic review of personality trait change through intervention.
Psychological Bulletin · 2017
Evidence layer
Claim by claim
What the story asserts. With no source study, there is nothing to check these against.
Reading mode
Scan verdicts. Open evidence only when needed.
Claim 1 of 6Not checkedResearchers testing birth-order predictions have found that birth order has no durable predictive power over personality.View evidenceHide evidence
Not checked
NewsLink could not identify one source study, so this claim was not compared against a paper.
Claim 2 of 6Not checkedTwo decades of research suggests personality is far less static than once believed, and people retain the capacity to change.View evidenceHide evidence
Not checked
NewsLink could not identify one source study, so this claim was not compared against a paper.
Claim 3 of 6Not checkedA 2024 study of more than 710,000 people found that people with both older and younger siblings scored higher on honesty-humility and agreeableness, with middle children highest, but the effect was modest and family size mattered more than birth order.View evidenceHide evidence
As statedabout 1% or less of the observed variation
Not checked
NewsLink could not identify one source study, so this claim was not compared against a paper.
Claim 4 of 6Not checkedA 2023 study found that younger siblings ages 10 to 14 reported more risk-taking than firstborns, but the effect faded in the 20s and vanished by the 30s.View evidenceHide evidence
Not checked
NewsLink could not identify one source study, so this claim was not compared against a paper.
Claim 5 of 6Not checkedThe article says personality stability increases around age 30, shifts accelerate again after 60, and emotional stability continues to increase into older age.View evidenceHide evidence
Not checked
NewsLink could not identify one source study, so this claim was not compared against a paper.
Claim 6 of 6Not checkedThe article says interventions and sustained behavioral exercises can produce meaningful and durable personality change, especially for neuroticism and extroversion.View evidenceHide evidence
Not checked
NewsLink could not identify one source study, so this claim was not compared against a paper.
Method layer
No single source study was found.
NewsLink still surfaces nearby research so you can inspect the field instead of a single paper.
Nearby research
No exact source, but these papers are close.
Crossref, PubMed, Europe PMC · 19 candidate papers
Birth‐order effects on risk taking are limited to the family environment
Annals of the New York Academy of Sciences · 2024 · Crossref
Life events sometimes alter the trajectory of personality development: Effect sizes for 25 life events estimated using a large, frequently assessed sample
Journal of Personality · 2024 · PubMed, Crossref
A systematic review of personality trait change through intervention.
Psychological Bulletin · 2017 · Crossref
Changing personality traits with the help of a digital personality change intervention
Proceedings of the National Academy of Sciences · 2021 · Crossref
Personality differences between birth order categories and across sibship sizes.
Proceedings of the National Academy of Sciences of the United States of America · 2025 · PubMed, Europe PMC
And 14 more candidates considered.