Applied behavior analysis programs for autism: sibling psychosocial adjustment during and following intervention use.

Benson (2012) tracked brothers and sisters while their preschool sibling with autism got 20–30 hours of home-based ABA each week.

The team compared 28 ABA families with the families on a wait list. They used parent forms, teacher forms, and kid self-reports to check behavior, self-concept, and sibling warmth one year later.

Siblings in ABA homes looked the same as control siblings on every score. Teachers saw no extra acting out, parents saw no drop in self-esteem, and the kids still liked playing together.

The only hint of change: parents in ABA homes said brothers and sisters got a little nicer to each other, but the numbers did not reach statistical significance.

LeFrancois et al. (1993) warned that siblings of autistic kids show more behavior problems when no treatment is underway. Benson (2012) shows that adding intensive ABA does not add new risk; it simply keeps siblings at the same level as typical families.

Johnson et al. (2009) looks like a contradiction—they found more emotional problems in siblings. The key difference: their sample mixed autism plus intellectual disability, while Benson (2012) served children with autism only. Extra disability, not ABA, likely drives the extra stress.

Perez et al. (2015) extends the story by showing that family stress and the sibling’s own autism-like traits shape outcomes. Benson (2012) did not measure those moderators, so the null finding may hide families who actually improved or worsened.

You can reassure worried parents: bringing 25 hours of ABA into the living room will not harm the neurotypical sibling. Still, keep brief sibling check-ins on your radar—especially if the autistic child also has ID—because ABA alone does not immunize brothers and sisters from stress.