Any parent of more than one kid knows the confusion of watching two kids from the exact same house (same rules, same snacks, same everything) turn out completely different when it comes to sharing, or noticing when someone else is having a hard day. It’s tempting to chalk it up to personality, birth order, or luck of the draw.
But sharing, noticing, comforting (the stuff developmental and clinical psychologists lump together as “prosocial behavior”) isn’t just a quirk of who a kid happens to be. It’s one of the better predictors we have of how a kid does later: with friends, in school, even for their own well-being. Which is exactly why a new study on where prosocial behavior comes from got my attention. It’s got some genuinely good news in it.
I’ve spent a decade teaching developmental psychology and researching emotional well-being in children, and I’ll be honest: most of what I actually know about why one kid shares easily and another guards the crayons like Fort Knox comes down to a shrug and “it’s complicated.” Temperament matters. So does age. So does whether someone’s hungry. But a new study points to something more concrete — independent parental support.
Prosocial behavior: voluntary actions that benefit other people: sharing, cooperating, helping, noticing when someone else is upset and doing something about it.
Instrumental social support: not a “thinking of you” text. This is: can someone actually watch your kid in an emergency, lend you money if you’re short, or let you crash at their place if you need to. Practical help that shows up when it counts.
Coparent support: support that comes specifically from your co-parent, not outside friends or family. Are they actually pitching in on the stuff that matters to you?
Let’s start with why prosocial behavior gets its own research field instead of just being filed under “nice kid, good job.” Prosocial behavior (cooperating, sharing, comforting, helping) is linked to kids’ academic achievement, not just their popularity (Caprara et al., 2000), and to their own psychological well-being, not just their friends’ (Layous et al., 2012). And the good news is, it’s sticky in a good way: prosocial behavior that shows up in middle childhood tends to still be visible in adolescence, rather than fading out on its own (Flynn et al., 2015; Eisenberg et al., 2013). So building it early isn’t a short-term win since it compounds.
A new study went looking for where that early boost comes from and specifically focused on what’s happening with both mom and dad together, as a pair. Chang (2026) followed 4,329 mother-father pairs from a large U.S. birth cohort, tracking each parent’s access to practical support from birth through age five (e.g., someone for emergency childcare, a place to stay if needed, $200 in a pinch, and support from their coparent).
Here’s the encouraging part: most families had it. About two-thirds of the parent pairs fell into a group researchers called “High and Concordant,” meaning that both parents with strong, steady, practical support the entire 5 years. And these were the families whose kids showed the most prosocial behavior of any group, both at age 5 and at age 9. Sharing, cooperating, noticing when someone needed help — the kids in these families were reliably doing more of it.
For comparison, two smaller groups had support that was strong for one parent but weaker or less steady for the other:
Paternal-Advantaged, Declining Maternal (20% of families): dad’s support stayed high and stable; mom’s started off fine but thinned out over time.
Maternal-Advantaged (16%): mom had solid support; dad’s was moderate but stable.
Kids in both of these groups showed somewhat less prosocial behavior at age 5 than kids in the fully-backed-up group, which lines up with earlier research showing that when moms have more people to lean on, their preschoolers are more likely to share with peers (Ensor & Hughes, 2010). By age 9, kids in the “mom has more support” group had mostly closed that gap. The takeaway isn’t “less support dooms your kid” but that full, steady, shared support seems to give kids the biggest and most durable head start.
Two findings help explain why full support (from both parents) outperforms partial support:
Mothers’ and fathers’ parenting doesn’t influence kids identically or interchangeably (Gryczkowski et al., 2018), so support for one parent doesn’t simply substitute for support for the other. Both contribute something real.
A 2026 meta-analysis spanning 65 studies and over 150,000 kids found that father involvement and warmth predicts children’s social-emotional skills in its own right, not just as backup to mom (Zheng et al., 2026). Dad having his own support is a genuine, independent lever.
The likely mechanism is straightforward and understandable: parents with more support have more bandwidth for the warm, responsive parenting that reliably predicts kids’ prosocial skills, a pattern that holds up across 124 studies and multiple cultures (Wong et al., 2021). Support isn’t just a buffer against stress; it seems to directly fuel the kind of parenting that grows kindness in kids.
It is worth saying clearly: this is correlational, not causal. We cannot say support alone builds prosocial kids — parents who are more socially resourced may also parent in ways that build prosocial kids for other reasons entirely. But the size of the sample, and the fact that the pattern held even after accounting for poverty, education, and depression, make a strong case that support for both parents is worth treating as a real asset, not a luxury.
Here’s the reframe I love from this study: parental support isn’t just a nice-to-have for the adults. It functions almost like a parenting intervention for kids’ kindness. Every time you build in real backup for your co-parent, you’re not just making your own life easier, but you’re building the exact conditions this research links to more sharing, more cooperation, more noticing-and-helping in kids.
It also reframes something I hear constantly from parents and teachers: “he just won’t share,” “she doesn’t seem to notice when her friend is upset.” Instead of treating that as a fixed trait, this research points to something concrete and actionable: check whether both parents (not just the default parent) have real, practical support.
This can be as simple as making sure both parents have someone they could call in an emergency, and revisiting that occasionally instead of assuming it’s set-it-and-forget-it.
Kids get kinder when both parents have people to lean on, not just one. A well-supported family isn’t just easier on the parents. It’s how kids learn to be good to each other.
Prosocial behavior (sharing, cooperating, noticing others’ feelings) predicts real outcomes down the road, and gains made early tend to stick.
Full, steady support for both parents was linked to the most prosocial kids, more than any other pattern in the study.
Marital status (married, cohabiting, separated) didn’t predict outcomes here. The actual, practical backup each parent had did.
It’s not about total support in the household. It’s about whether each parent, individually, has backup.
Dads’ own support and involvement matters independently of mom’s support.
A concrete step: make sure both parents have someone they could call in a pinch, and check in on that periodically.
Development Decoded is built on a simple belief: science should be clear, practical, and accessible to anyone who cares about kids. I write, research, and create resources outside of my day job and family life to make that happen. If you’d like to help fuel the work, you can now do so with one coffee at a time.
Caprara, G. V., Barbaranelli, C., Pastorelli, C., Bandura, A., & Zimbardo, P. G. (2000). Prosocial foundations of children’s academic achievement. Psychological Science, 11(4), 302–306.
Chang, O. D. (2026). Mothers’ and fathers’ social support trajectories and children’s prosocial development: A dyadic perspective. Development and Psychopathology, 1–11. https://doi.org/10.1017/S0954579426101618
Eisenberg, N., Spinrad, T. L., & Morris, A. S. (2013). Prosocial development. In P. D. Zelazo (Ed.), The Oxford handbook of developmental psychology: Self and other (Vol. 2, pp. 300–320). Oxford University Press.
Ensor, R., & Hughes, C. (2010). With a little help from my friends: Maternal social support, via parenting, promotes willingness to share in preschoolers born to young mothers. Infant and Child Development, 19(2), 127–141.
Flynn, E., Ehrenreich, S. E., Beron, K. J., & Underwood, M. K. (2015). Prosocial behavior: Long-term trajectories and psychosocial outcomes. Social Development, 24(3), 462–482.
Gryczkowski, M., Jordan, S. S., & Mercer, S. H. (2018). Moderators of the relations between mothers’ and fathers’ parenting practices and children’s prosocial behavior. Child Psychiatry & Human Development, 49(3), 409–419.
Layous, K., Nelson, S. K., Oberle, E., Schonert-Reichl, K. A., & Lyubomirsky, S. (2012). Kindness counts: Prompting prosocial behavior in preadolescents boosts peer acceptance and well-being. PLoS One, 7(12), e51380.
Wong, T. K. Y., Konishi, C., & Kong, X. (2021). Parenting and prosocial behaviors: A meta-analysis. Social Development, 30(2), 343–373. https://doi.org/10.1111/sode.12481
Zheng, Q., Cai, L., Huang, P., Huang, W., & Ni, Y. (2026). Father’s involvement is critical in social-emotional development in early childhood: A meta-analysis. Early Childhood Research Quarterly, 74, 26–34. https://doi.org/10.1016/j.ecresq.2025.08.001

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