Sex Differences In Parental Investment: Evidence From 13 Domains Of Parenting

The study, led by F. Sid Dougan and colleagues, drew on data from 105 adults who had previously participated in a long-term project tracking newlywed heterosexual couples. Participants were initially recruited in 1989 through marriage records in Washtenaw County, Michigan, and were followed over time.

For the present analysis, the researchers focused on data collected during the couples’ third year of marriage, when participants were between 19 and 36 years old, with an average age of 26. Most participants identified as White and reported being raised in suburban communities in the United States.

Participants completed a 105-item questionnaire about the behaviors of their biological mothers and fathers during their upbringing. Each behavior was rated separately for each parent on a scale from 0 (“not at all”) to 7 (“a great deal”).

The researchers then grouped the reported behaviors into conceptually distinct domains. After removing unclear or duplicate items, they identified 73 behaviors organized into 13 categories representing different forms of parental investment.

Thirteen Domains of Investment

The 13 domains captured a broad range of parental support, from everyday caregiving to life guidance. These included mating and relationship guidance, athletics and physical training, mechanical and practical skills, and social and moral guidance.

Additional domains included competitive encouragement, sexual permissiveness, direct care and domestic support, bonding and emotional support, and education and career support. Protection, discipline and regulation, wisdom and life guidance, and material provisioning were also included in the framework.

By analyzing these domains, the researchers were able to move beyond simple measures of time or money spent on children. Instead, they examined the specific ways parents invest in sons and daughters and how mothers and fathers differ in these investments.

Differences Between Mothers and Fathers

Across all domains combined, mothers were rated as providing greater overall parental investment than fathers, particularly toward daughters. This finding reflects stronger maternal involvement in many day-to-day and emotional aspects of parenting.

Mothers invested more than fathers in direct care and domestic support, including feeding, organizing routines, and household responsibilities. They also scored higher in bonding and emotional support, social and moral guidance, discipline and regulation, mating and relationship guidance, and wisdom and life advice.

Fathers, by contrast, tended to invest more in athletics and physical training, as well as mechanical and practical skills. These domains often involve sports coaching, hands-on activities, and instruction in the use of tools or repairs, areas in which fathers were perceived as more actively involved than mothers.

Some categories showed little or no difference between mothers and fathers. Notably, education and career support appeared relatively balanced, suggesting that both parents tended to support their children's academic and professional development to a similar extent.

How Sons and Daughters Are Treated

The study found that sons and daughters receive different types of parental investment rather than more or less investment overall. Daughters reported receiving more support in mating and relationship guidance, protection, and material provisioning, including financial assistance and practical resources.

Sons received greater investment in athletics and physical training, competitive encouragement, and sexual permissiveness. In practice, this may translate into greater support for sports and competition, as well as a relatively more permissive attitude toward boys’ sexual behavior.

This pattern is consistent with evolutionary perspectives suggesting that parents may adapt their efforts to the different social and reproductive challenges historically faced by sons and daughters. However, the authors caution that these patterns are shaped by both biological and cultural influences.

Importantly, domains such as education and career support did not demonstrate strong sex-based differences, indicating that at least some forms of parental investment were distributed relatively evenly between sons and daughters in this sample.

Interactions Between Parent and Child Sex

The study also identified notable interactions between the sex of the parent and the sex of the child. Mothers demonstrated a stronger focus on daughters in certain relational and guidance-related domains, particularly mating and relationship support.

Fathers showed a more pronounced focus on sons in athletics and physical training, as well as mechanical and practical skills. This finding suggests that fathers may more often assume the role of coach or instructor for boys in physically demanding or technically oriented activities.

These patterns point to a complex, domain-specific structure of parental investment in which both parent and child sex influence how support is provided. The findings challenge the simplistic notion that one sex is universally preferred or receives greater parental investment overall.

Limitations and Wider Context

The authors emphasize that the sample was relatively small and drawn from a Western, educated, industrialized, rich, and democratic population. Most participants were White, middle-class Americans, limiting the extent to which the findings can be generalized across cultures and historical periods.

Parenting norms have also evolved since the original recruitment in 1989, reflecting changing gender roles, shifting expectations regarding father involvement, and increased attention to equality within families. Contemporary parents may therefore exhibit different patterns, particularly in younger and more diverse populations.

Despite these limitations, the study adds important detail to longstanding debates about parental favoritism and sex-based differences in parental investment. Rather than asking whether parents favor sons or daughters overall, the findings highlight the importance of examining the specific types of support children receive and which parent provides them.