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Are Siblings of Autistic Children More Empathetic? What the Research Really Shows

23 August 2026

There is a sentence that appears in almost every article written for autism families: children who grow up alongside an autistic brother or sister become more empathetic adults.

We wanted to cite it. So we went looking for the study behind it.

It is not there.

What is there is more interesting — and, we think, more respectful of the children it is about.

The short answer

The best available synthesis — 16 studies, 1,066 siblings — concludes that siblings of autistic children have normative empathy and prosocial behaviour. Not higher. Not lower. Typical.
Individual studies point both ways, and which way often depends on who was asked: parent ratings tend to find more empathy, behavioural observation tends to find less.
A larger meta-analysis of 69 samples found small but real disadvantages in internalising symptoms — anxiety, depression, beliefs about disability.
When siblings are interviewed in their own words, they describe real gains in compassion and maturity — alongside hypervigilance, reluctance to talk about their family at school, and worry about the future.
Sibling support programmes produce small, genuine improvements in self-esteem and knowledge; effects on anxiety and depression are inconsistent.

What the systematic review found

The most direct answer comes from a systematic review in the Review Journal of Autism and Developmental Disorders, which pooled 16 studies covering 1,066 siblings of autistic children (Orm, Vatne, Tomeny & Fjermestad, 2021).

Its conclusion, in the authors' own words: siblings of autistic individuals "exhibit normative empathic abilities and prosocial behavior."

The underlying studies split roughly like this:

Outcome	Studies finding higher	Studies finding no difference	Studies finding lower
Empathy (7 studies)	2	3	4 (some age groups)
Prosocial behaviour (10 studies)	2	4	4

The reviewers also note that differences observed in toddlers diminished by age three, that methodological quality varied widely, and that results differed by culture.

The measurement story hiding inside the mixed results

Look at where each result came from and a pattern appears.

The studies that found elevated empathy tended to rely on parent report or self-reported perspective-taking:

36 siblings: no significant difference in observed empathy, but parents rated them higher in empathy and prosocial behaviour (McDonald, Murphy & Messinger, 2017, Autism Research)
26 adolescent siblings: no overall empathy difference, but significantly higher perspective-taking (d = 0.55) (Shivers, 2019, Research in Developmental Disabilities)
69 siblings: higher mother-reported prosocial behaviour (d = 0.35) (Walton & Ingersoll, 2015, Journal of Autism and Developmental Disorders)

The studies that found reduced empathy or prosocial behaviour more often used behavioural observation or standardised questionnaires:

59 siblings: reduced empathy at 22 and 28 months (d = −0.58; d = −0.40) (Campbell et al., 2017, JADD)
116 siblings: lower prosocial behaviour in both sexes (d = −0.59 to −0.86) (Chan & Lai, 2016, East Asian Archives of Psychiatry)
168 siblings: prosocial behaviour below population norms (d = −0.33 to −0.36) (Griffith, Hastings & Petalas, 2014, JADD)
155 siblings in the UK and Taiwan: reduced prosocial behaviour in the Taiwan sample only (Tsai, Cebula & Fletcher-Watson, 2016, Research in Autism Spectrum Disorders)

(Sample sizes and effect sizes for the studies above are as tabulated in the Orm et al. systematic review.)

That last one matters. Culture moderated the result. Whatever is being measured, it is not a fixed property of "having an autistic sibling."

So the popular claim is not a small exaggeration of a real finding. It is a description of how parents see their children, presented as a measured trait. Which is worth saying gently, because parents are not wrong about what they see.

The harder finding nobody quotes

There is a second body of evidence, and it is larger.

A meta-analysis of 69 independent samples comparing siblings of autistic people with various control groups found small but consistent disadvantages (Shivers, Jackson & McGregor, 2019):

Overall functioning: g = −0.26
Beliefs about disability: g = −0.56
Anxiety: g = −0.25
Depression: g = −0.36

There were no significant differences in adjustment, attention, externalising behaviour, coping or family functioning. The effects are small. But they run in the opposite direction to the story usually told.

Taken together with the empathy review, the fair reading is this: siblings of autistic children are, on measured empathy, ordinary children. They carry somewhat more internal weight than their peers. And the cheerful version of their story may be making that weight harder to talk about.

What siblings say when you ask them

Now the part that is genuinely encouraging — and it comes from the siblings themselves, not from a questionnaire.

In an interview study with 20 siblings aged 13–24 and 21 parents, the first theme researchers identified was "learning, empathy, and compassion" (Iannuzzi et al., 2022).

The other four themes were:

relationship quality that tracked how much support their sibling needed
reluctance to tell peers about their brother or sister
hypervigilance around unpredictable behaviour
worry about the future — often about who will care for their sibling later

A qualitative meta-synthesis reached similar ground: empathy and maturity appearing alongside stress, in the same young people, at the same time (Douglas, Bagawan & West, 2024).

This is the honest version of the sentence everyone wants to write. Not siblings become more empathetic, but: siblings describe learning compassion, and they describe carrying things a child should not have to carry alone. Both are true. Only one of them usually gets said out loud.

Does supporting siblings actually work?

Yes — modestly, and in specific areas.

A mixed-methods systematic review screened 2,025 records and included 24 studies on sibling support programmes (Wolff et al., 2023). Findings:

Largest immediate gains: self-esteem, social wellbeing, and knowledge of the condition
Best sustained at follow-up: emotional and behavioural adjustment, and knowledge
Versus waitlist controls: "positive, but small, differences"
Less consistent: anxiety, depression, quality of life

The limitations are substantial and the reviewers say so: mostly moderate-to-low quality studies, a median sample of about 37, only 7 studies with extended follow-up — and a detail worth pausing on, parents consistently reported greater improvement than the siblings themselves did.

A randomised controlled trial of a sibling support group against an attention-matched control found that "some areas of mental health improved," with the severity of the autistic child's support needs moderating the effect (Jones et al., 2020).

And one finding with a neat twist: a review of 19 studies of sibling-mediated interventions — where the sibling is trained to help the autistic child — found effect sizes that were low for the autistic children and moderate for the siblings (Bilgili-Karabacak et al., 2024). Giving a child a role helped the child in the role.

Why we still think stories matter for the whole family

If empathy is not automatically conferred by proximity, then it has to be built. That is not a discouraging conclusion — it is a practical one.

The strongest evidence in the whole field of children's attitudes is about contact: in-person contact improved children's attitudes toward disability (d = 0.55), and extended contact — knowing that someone like you is friends with someone like them — worked as well (d = 0.61). Media-based contact, on its own, was not statistically significant (Armstrong et al., 2017).

And the six-week story-reading study that worked, worked because of how it was used: adult-led, sustained, and framing disabled and non-disabled children as friends (Cameron & Rutland, 2006).

That is a design brief. A book or an episode is not a delivery mechanism for empathy. It is a shared object — something a family can sit with, point at, argue about, and use to say the thing that is hard to say directly. For a sibling who is reluctant to explain their brother to their classmates, having a character to point to is not a small thing.

The two-directional part

There is one more reframing worth knowing, because it changes what "empathy" is even supposed to mean here.

Research increasingly supports the idea that communication breakdown between autistic and non-autistic people is mutual rather than one-sided. In one study, information passed through chains of eight people: autistic-only chains and non-autistic-only chains retained information equally well, while mixed chains retained significantly less (Crompton et al., 2020). A later study found that autistic–autistic interactions did not differ from non-autistic ones on interaction quality; mixed interactions were rated least successful (Jones et al., 2024).

This framework — the "double empathy problem" — is actively debated among researchers, and we would not present it as settled. But its empirical core is well replicated, and it moves the question. The point is not whether an autistic child can read their sibling. It is whether the two of them have been given anything that helps them read each other.

What parents can do with this

Say the true version. "You've learned a lot from your brother" is real. "You're more empathetic than other kids because of him" puts a job on a child's shoulders.
Ask siblings directly, not through parents. The research consistently shows parents rate sibling wellbeing more positively than siblings rate it themselves.
Watch for the specific things siblings report: not telling friends, watching the room for signs of an oncoming meltdown, worrying about the future. These are not sulking. They are the documented pattern.
Give the sibling a role rather than a duty. Sibling-mediated programmes benefited the sibling in the role more than anyone else.
Use the book or the episode as a starting point, not the lesson. The evidence is for reading with, repeatedly, framed as friendship.

Frequently asked questions

Are siblings of autistic children more empathetic? No — not as a measured trait. A systematic review of 16 studies covering 1,066 siblings concluded they have normative empathy and prosocial behaviour. Individual studies point in both directions, and results often depend on whether parents or observers did the rating.

Is it harder to be the sibling of an autistic child? Somewhat, on average. A meta-analysis of 69 samples found small but consistent disadvantages in overall functioning, anxiety and depression, with no differences in adjustment, coping or family functioning.

What do siblings themselves say they gained? In interview studies the first theme is learning, empathy and compassion — reported alongside hypervigilance, reluctance to tell peers about their sibling, and worry about the future.

Do sibling support groups help? Yes, modestly. Across 24 studies the clearest gains were in self-esteem, social wellbeing and knowledge about the condition. Effects on anxiety and depression were inconsistent, and siblings reported smaller gains than their parents did.

How common is autism? The CDC's most recent surveillance estimate is about 1 in 31 eight-year-olds across 16 US monitoring sites in 2022. A global systematic review puts the median at about 1 in 100. The two figures measure different things.

Sources

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