Sex differences and within-family associations in the broad autism phenotype.
Fathers’ own autism-like traits predict child autism severity more strongly than mothers’, so screen dads first.
01Research in Context
What this study did
Day-Watkins et al. (2014) asked 67 moms and dads of autistic kids to fill out two short checklists. One listed broad autism traits like being aloof or rigid. The other rated the child’s autism severity in social, communication, and repetitive domains.
The team then looked for links between each parent’s own trait score and how severe the child’s autism appeared.
What they found
Fathers scored higher than mothers on the “aloof” trait. More importantly, when dads carried more broad autism traits, their children showed greater autism severity across all areas.
Mothers’ trait scores only tied to child communication problems, not social or repetitive behaviors.
How this fits with other research
Rivard et al. (2014) asked the same families a different question: how stressed are you? They found fathers again stood out—reporting higher stress than moms—and the stress rose with child symptom severity. The two 2014 studies echo each other: dads’ inner experience mirrors child severity more than moms’.
Perzolli et al. (2026) filmed Italian dads playing with their autistic preschoolers. Sensitive, chatty dads had more responsive kids. Jessica’s trait data and Silvia’s live behavior data line up—father characteristics keep showing a stronger child link.
Palka Bayard de Volo et al. (2021) moved from description to genetics. They showed that adult autism trait scores are strongly heritable. Jessica’s finding that paternal traits predict child severity now makes genetic sense—dads may pass along those measurable traits.
Why it matters
When you take a family history, spend extra time with fathers. A quick ten-item broad autism checklist can flag dads whose own mild traits may signal higher child support needs. Share the results with the team to fine-tune social and communication goals, especially for boys, and to start dad-focused stress management early.
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02At a glance
03Original abstract
While there is a strong sex bias in the presentation of autism, it is unknown whether this bias is also present in subclinical manifestations of autism among relatives, or the broad autism phenotype. This study examined this question and investigated patterns of co-occurrence of broad autism phenotype traits within families of individuals with autism. Pragmatic language and personality features of the broad autism phenotype were studied in 42 fathers and 50 mothers of individuals with autism using direct assessment tools used in prior family studies of the broad autism phenotype. Higher rates of aloof personality style were detected among fathers, while no sex differences were detected for other broad autism phenotype traits. Within individuals, pragmatic language features were associated with the social personality styles of the broad autism phenotype in mothers but not in fathers. A number of broad autism phenotype features were correlated within spousal pairs. Finally, the associations were detected between paternal broad autism phenotype characteristics and the severity of children's autism symptoms in all three domains (social, communication, and repetitive behaviors). Mother-child correlations were detected for aspects of communication only. Together, the findings suggest that most features of the broad autism phenotype express comparably in males and females and raise some specific questions about how such features might inform studies of the genetic basis of autism.
Autism : the international journal of research and practice, 2014 · doi:10.1177/1362361312464529