The research, conducted by Jeenkyoung Lee of the University of Missouri and published in the journal Applied Research in Quality of Life, drew on the Health and Retirement Study, a nationally representative biennial panel of U.S. adults aged 50 and older. The analytical sample included 7,217 older adults with an average age of 73.57, about 62 percent of whom were women. Relationship quality was assessed at four time points spanning 2006/2008 through 2018/2020, using questionnaires that captured both positive dimensions of the parent-child bond, such as feeling understood and being able to rely on children, and negative dimensions, including criticism, excessive demands, and being let down when counting on them.

Technically, the study employed growth mixture modeling, a statistical approach that does not assume all people follow the same developmental path. Instead, it searches for hidden subgroups within the population whose trajectories of change differ qualitatively. For both positive and negative relationship quality, the analysis identified five distinct trajectory groups: high-stable, moderate, increasing, decreasing, and low-stable. The vast majority of older parents, 69 percent, belonged to the high-stable positive relationship group, while 62 percent sat in the low-stable negative group, confirming that most aging parents enjoy warm, low-conflict ties with their children. Yet meaningful minorities occupied less comfortable positions, including a small but notable 3 percent whose negative relationship quality climbed sharply from a low starting point over the 16-year window.

The theoretical scaffolding for the work combines the interpersonal mechanisms model with the life course perspective. The former, rooted in attachment theory, proposes that support, intimacy, and hostility in close relationships shape long-term well-being through emotional regulation, stress physiology, and behavioral pathways. The latter emphasizes the principle of linked lives, the idea that human destinies unfold interdependently within family networks, and the concept of accumulated effects, whereby sustained exposure to stress or support compounds gradually over decades. From this vantage point, a single snapshot of family harmony or discord tells only part of the story; it is the enduring pattern, whether stable, improving, or deteriorating, that may matter most for health.

When the researchers linked trajectory group membership to cognitive function, measured with the modified Telephone Interview for Cognitive Status, a 27-point screening battery covering word recall, serial subtraction, and backward counting, a clear asymmetry emerged. Only the negative relationship trajectories predicted cognition. Older parents in the increasing negative relationship group had significantly poorer cognitive function, whereas those in the low-stable negative group showed significantly better function. Intriguingly, the high-stable negative group, whose members reported persistently elevated conflict, was not significantly worse off, suggesting that it is the worsening of a relationship, rather than its chronic strain alone, that signals cognitive risk. This pattern aligns with the emergent distress model, which holds that rising negativity over time is particularly corrosive because it reflects growing relational breakdown rather than a settled, if unhappy, equilibrium.

The positive relationship trajectories, by contrast, showed no significant associations with cognitive function on their own. The authors offer several explanations. Global evaluations of the parent-child bond may not capture the kinds of stimulating interactions that, from a social neuroscience perspective, engage neural circuits and trigger the release of neurochemicals such as oxytocin and dopamine, which have been linked to cognitive benefit. There is also the intergenerational stake hypothesis to consider: older parents tend to evaluate their relationships with children favorably, which compresses variability in positive ratings and may blunt their statistical association with health outcomes. Notably, however, a joint-effect analysis revealed that parents who combined consistently high positive relationship quality with consistently low negative quality, the best of both worlds, exhibited better cognitive function than would be expected from either dimension alone.

Perhaps the most surprising finding concerned gender. Prior literature has often portrayed mothers as the family’s kin-keepers, more emotionally invested in children and more vulnerable to relational stress, with some earlier studies finding that parent-child strain took a heavier toll on mothers’ psychological well-being. Given this backdrop, the study hypothesized that relationship trajectories would matter more for mothers’ cognition. Instead, multiple-group structural equation models, in which the paths from trajectory membership to cognition were first constrained and then freed to differ by gender, showed no significant differences between mothers and fathers. Chi-square difference tests and Wald tests were uniformly non-significant across the positive, negative, and joint-effect models. Long-term patterns of parent-child relationship quality, particularly the negative ones, appear to carry comparable weight for the cognitive health of aging men and women.

The study controlled extensively for potential confounders, including age, race, ethnicity, education, household wealth, marital status, urban versus rural residence, self-rated health, difficulties with activities of daily living, total number of children, and baseline cognitive function. Even after these adjustments, the associations between negative relationship trajectories and cognition held. Sensitivity analyses by study entry cohort and by the extent of missing data produced no meaningful changes in the results, strengthening confidence in the findings, though the authors caution that selective participation and attrition remain unavoidable challenges in longitudinal aging research.

Several limitations temper the conclusions. The relationship measures aggregated parents’ perceptions across all their children, potentially diluting the influence of particularly close or particularly fraught individual bonds; geographic proximity, which is restricted in the Health and Retirement Study data, could not be examined. The four-year intervals between assessments may have missed shorter-term fluctuations, and the cognitive screening tool provides only a global measure rather than domain-specific performance or biological markers such as brain imaging. The pooling of two entry cohorts also meant that the final assessment for later participants coincided with the COVID-19 pandemic, a period with documented cognitive effects, although sensitivity analyses found no cohort-related differences in the main results.

Even with these caveats, the implications are substantial. As populations age and cognitive impairment places mounting pressure on families and health systems, the findings point to an underappreciated lever: the emotional quality of intergenerational ties. Because it was the deterioration of relationships, not merely their chronic negativity, that tracked with poorer cognition, the results suggest that shifts toward conflict in a parent-child bond may serve as an early warning sign worth monitoring. The author argues for relationship-based interventions and public health initiatives that look beyond the marital dyad to encompass the enduring influence of adult children on their aging parents’ minds. In a demographic landscape where adult children increasingly serve as primary caregivers, keeping those relationships from souring may be not just a matter of family harmony, but a component of cognitive protection in late life.

Subject of Research: Long-term trajectories of parent-child relationship quality and their association with cognitive function in older adults

Article Title: Trajectories of Parent-Child Relationship Quality and Cognitive Function among Older Adults: Differences between Mothers and Fathers

Article References: Lee, J. (2026). Trajectories of Parent-Child Relationship Quality and Cognitive Function among Older Adults: Differences between Mothers and Fathers. Applied Research in Quality of Life. https://doi.org/10.1007/s11482-026-10670-y

Image Credits: AI Generated

DOI: 10.1007/s11482-026-10670-y

Keywords: cognitive function, parent-child relationship quality, older adults, aging, Health and Retirement Study, growth mixture modeling, intergenerational relationships, mothers and fathers, life course perspective, relational stress, structural equation modeling, cognitive decline