The table where it either gets discussed or carefully doesn’t. Photo: Boris Dunand on Unsplash.1
TL;DR
Twin studies find that political and religious disposition — how strongly someone leans toward tradition or novelty, caution or risk — has a substantial genetic component, while the specific label a person adopts (which party, which denomination) is mostly learned from environment, not inherited.2 That split explains the “opposite of their parents” cases better than rebellion does: a child can inherit the underlying temperament while landing on a completely different banner for it, especially if the original transmission was coercive rather than persuasive.3 Two of the tidiest popular explanations for this — a personality-trait mismatch, and social-media algorithms dragging kids into opposing echo chambers — turn out to be considerably weaker than they’re usually given credit for.45
The Father’s Curse: The Ungrateful Son, Jean-Baptiste Greuze, 1777 — public domain.1
The Household That Argues With Itself
It’s a familiar shape: a devoutly religious household produces an atheist; a staunchly partisan family produces the opposite voter. The instinctive explanation is teenage rebellion, dressed up as ideology. That explanation is trying to do too much work. There’s a real, tested literature on why this happens, and it points to something more specific than “kids push back” — and it starts by asking what’s actually being transmitted in the first place.
What’s Actually Inherited
A landmark twin study compared political attitudes between identical and non-identical twins to isolate a genetic signal, and it found something easy to miss if you’re only listening for one number: genetics plays an important role in shaping political attitudes and ideology, but a distinctly more modest role in shaping party identification — which side of the aisle someone actually votes for.2 Later work extended the same logic to religion and found the identical pattern: religious disposition — how spiritually inclined someone is, independent of doctrine — is substantially heritable, while religious affiliation, the specific faith someone practices, is essentially learned from parents rather than inherited.3
That’s the split the “opposite of their parents” story keeps missing. The underlying disposition — how open to authority, tradition, and risk a person runs — has a real biological component and often does pass from parent to child intact. What doesn’t reliably pass down is the specific label attached to that disposition. An atheist father with a strong, rule-testing, tradition-skeptical temperament can raise a son with the identical temperament who happens to land on devout belief as his particular way of testing rules and defying an unquestioned family default. Same underlying wiring, opposite banner.
Freedom, Threatened, Gets Defended
How that transmission actually happens matters as much as what’s being transmitted. Psychologist Jack Brehm’s reactance theory, dating to 1966, describes a specific, well-replicated mechanism: when someone perceives a freedom or choice being taken away, they become motivated to reclaim it — often by doing the exact opposite of what’s being pushed on them, independent of what they actually think about the content.4 It’s the same mechanism behind a “wet paint, do not touch” sign making people want to touch the wall, or a mask mandate turning a public-health measure into an identity fight.
Applied to belief transmission, the prediction is specific and testable: it’s not disagreement with the content of a belief that drives kids to the opposite pole, it’s the coercion of the delivery. A household that states its politics or faith and leaves room for its kids to actually disagree is exercising much weaker reactance-triggers than one that treats disagreement as betrayal. The rebellion, where it shows up, is a response to the control, not a verdict on the content.
The Trait Story Is Weaker Than It Looks
One of the tidier popular explanations reaches for personality: liberals score higher on Openness to Experience, conservatives score higher on Conscientiousness, therefore a child born with the “wrong” trait for their household is destined to clash with it. The correlation itself is real and well-replicated. What’s much shakier is the causal story built on top of it. A study following more than 17,000 people over 20 years found no evidence that actual changes in a person’s Openness predicted subsequent changes in their conservatism, or the reverse — once analyzed with more rigorous longitudinal methods, the tidy causal arrow largely disappeared, and the personality-ideology link looks more like each shapes the other earlier in life and then the two simply sit correlated afterward, not a live mechanism actively pulling people apart in real time.5
Blaming the Algorithm Is the Easy Story
The other reflexive explanation is social media: kids fall into a recommendation-engine echo chamber and drift away from the household’s views by algorithmic accident. A study surveying more than 14,000 internet users across seven countries found this concern to be considerably overstated for most people. Politically engaged users don’t passively absorb whatever one platform feeds them — they actively cross-check information across multiple sources and are, if anything, exposed to more viewpoint diversity than disengaged users, not less.6 The people who actually do get stuck in a narrow information loop are a specific, smaller group: those with both low political interest and low media literacy, not the general population of kids diverging from their parents. The algorithm isn’t nothing, but it’s a much narrower villain than the story usually makes it out to be.
What’s Really Changing Between Generations
None of this erases generational political change — it’s a well-documented phenomenon political scientists call generational replacement, and a recent analysis spanning 258 national election surveys across 21 democracies from 1948 to 2021 found each successive cohort, right through Millennials and Gen Z, shifting further from older generations’ party preferences, reshaping party systems over decades in the process.7 The mechanism just isn’t primarily rebellion, personality mismatch, or algorithmic capture. It’s closer to this: a real, partly-inherited disposition gets handed down more reliably than the specific label attached to it, and whether a child keeps the parents’ label or swaps it for the opposite one depends heavily on whether that label was taught as a conclusion to consider or a loyalty test to pass.
The Tamil saying about the teacher’s child turning out unruly and the police officer’s child turning out a thief isn’t describing a failure of parenting. It’s an old, compressed way of noticing exactly this: what gets inherited and what gets rejected are very often not the same thing, and mistaking one for the other is where most of the household arguments start.
Footnotes
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https://unsplash.com/photos/brown-wooden-round-table-with-chairs-cGx58nNgE94 ↩ ↩2
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https://www.cambridge.org/core/journals/american-political-science-review/article/abs/are-political-orientations-genetically-transmitted/C6D3A60FBE6779C8E6E798600785A4C9 ↩ ↩2
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https://adambrown.info/p/notes/alford_funk_and_hibbing_are_political_orientations_genetically_transmitted ↩ ↩2
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https://thedecisionlab.com/reference-guide/psychology/reactance-theory ↩ ↩2
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https://www.psypost.org/2020/10/openness-does-not-predict-within-person-changes-in-political-beliefs-58412 ↩ ↩2
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https://theconversation.com/fake-news-echo-chambers-and-filter-bubbles-underresearched-and-overhyped-76688 ↩
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https://www.frontiersin.org/journals/political-science/articles/10.3389/fpos.2024.1279888/full ↩
