Adoption Status and Parental Investments: A Within-sibling Approach

Area of Science:

• Family Studies
• Sociology
• Developmental Psychology

Background:

• Previous research suggests adoptive parents invest equally or more than biological parents.
• Most studies compare families, not within families, to assess parental investment.
• Within-family comparisons can better isolate the impact of biological ties on parental investment.

Purpose of the Study:

• To investigate parental time and financial investments in adopted versus biological children within the same family.
• To isolate the relationship between biological ties and parental investments using within-family analysis.
• To examine if adopted children receive differential investments compared to their biological siblings.

Main Methods:

• Utilized data from the American Time Use Survey (2007-2018) and American Community Survey (2014-2018).
• Employed within-family fixed effects regression models for analysis.
• Assessed parental time (one-on-one, quality, total) and financial investments (private school enrollment).

Main Results:

• Parents spent less daily time with adopted children than biological children.
• While most families invested equally, adopted children were less likely to be privately schooled when siblings differed.
• Findings indicate potential disparities in parental investment within mixed-adoption families.

Conclusions:

• Adopted children in mixed-adoption families may receive fewer resources than their biological siblings.
• Highlights the importance of within-family studies for understanding parental investment.
• Suggests selection effects may explain some observed adoptive-child advantages.